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Мумия Фумия
Test por Мумия Фумия, actualizado hace más de 1 año
Мумия Фумия
Creado por Мумия Фумия hace casi 6 años
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Resumen del Recurso

Pregunta 1

Pregunta
1. The PEAR DB functions can be accessed using DB::<function_name>.
Respuesta
  • True
  • False

Pregunta 2

Pregunta
2. The string argument of the function for connecting to a database is of the format <DBMS software>://<user account>:<password>@<database server>
Respuesta
  • True
  • False

Pregunta 3

Pregunta
3. The PEAR DB functon for connecting to a database is called DB::linkto database('string').
Respuesta
  • True
  • False

Pregunta 4

Pregunta
4. The DBMS software in <DBMS software>://<user account>:<password>@<database server> stands for the particular DBMS software package being connected to: for example mysqli for versions of MySQL starting with version 4.1.2
Respuesta
  • True
  • False

Pregunta 5

Pregunta
5. The PEAR DB function DB::is Error can be used to determine whether any database access operation was successful or not.
Respuesta
  • True
  • False

Pregunta 6

Pregunta
6. In PHP, an _____ array provides pairs of key=>value elements; the value of an element is referenced through its key and all key values in a particular array must be unique.
Respuesta
  • a) Numeric
  • b) Value
  • c) String
  • d) Associative

Pregunta 7

Pregunta
7. Multi-line PHP comments start with // and end with #.
Respuesta
  • True
  • False

Pregunta 8

Pregunta
8. PHP written in C and usually comes installed with Unix: for other operating systems, the PHP interpreter can be downloaded from http://www.php.net
Respuesta
  • True
  • False

Pregunta 9

Pregunta
9. The PHP start tag is <?php and end the tag is ?>.
Respuesta
  • True
  • False

Pregunta 10

Pregunta
10. Web pages, where part of the information is extracted from databases or other data source, are called dynamic Web pages
Respuesta
  • True
  • False

Pregunta 11

Pregunta
11. In PHP, a ____ array associates a numeric index with each element in the array
Respuesta
  • a) Numeric
  • b) Associated
  • c) Variable
  • d) String

Pregunta 12

Pregunta
12. PHP variable names start with a $ sign and can include characters, numbers, and the underscore character
Respuesta
  • True
  • False

Pregunta 13

Pregunta
13. Interpolating variables occurs only within single-quoted strings.
Respuesta
  • True
  • False

Pregunta 14

Pregunta
14. PHP programs are executed on the client.
Respuesta
  • True
  • False

Pregunta 15

Pregunta
15. The auto-global predefined PHP variable $_POST is an array that holds all the values entered through form parameters.
Respuesta
  • True
  • False

Pregunta 16

Pregunta
16. The JDBC _____ libraries are called java.sql.*
Respuesta
  • a) Method
  • b) Function
  • c) Class

Pregunta 17

Pregunta
17. JDBC does not distinguish between queries that return single tuples and those that return multiple tuples.
Respuesta
  • True
  • False

Pregunta 18

Pregunta
19. The use of function calls is a more dynamic approach for database programming than embedded SQL.
Respuesta
  • True
  • False

Pregunta 19

Pregunta
20. A _____ object is similar to a cursor in embedded SQL and an iterator in SQLJ.
Respuesta
  • a) Procedure
  • b) Function call
  • c) Result Set

Pregunta 20

Pregunta
21. _____ is the part of the SQL standard that specifies how to write persistent stored modules.
Respuesta
  • a) SQL/PSM
  • b) XML
  • c) SQLJ
  • d) ResultSet

Pregunta 21

Pregunta
22. Database stored procedures (aka persistent stored modules) are stored and executed by the DBMS at the database server.
Respuesta
  • True
  • False

Pregunta 22

Pregunta
23. Discuss advantages and diadvantages to the library of function calls approach
Respuesta
  • a) Disadvantage are the loss of flexibility in changing the query at runtime and that all changes to queries must be recompiled.
  • b) The main advantage is flexibility in generating queries at runtime. Also, the library of function calls approach is able to call multiple data program.
  • c) The main advantage is flexibility in generating queries at compile time. Also, the library of function calls approach is able to call multiple single program.
  • d) Disadvantages are more complex programming, inability to do checking at compile time, and concerns about SQL runtime errors.
  • e) The main advantage is the query text is part of source code and can be checked for syntax errors and validated against the data. The program is quite readable.

Pregunta 23

Pregunta
24. It is necessary to have a binding between the data types of the programming language and the attribute data types in the data model
Respuesta
  • True
  • False

Pregunta 24

Pregunta
25. In SQLJ, embedded SQL commands are preceded by #sql.
Respuesta
  • True
  • False

Pregunta 25

Pregunta
27. One advantage of using an SQLJ translator is that it is not necessary to install drivers such as a JDBC driver.
Respuesta
  • True
  • False

Pregunta 26

Pregunta
28. Describe the three main approaches for database programming.
Respuesta
  • a) Using a library of database functions. This approach provides what is known as an application programming interface (API) for accessing a database from applications programs.
  • b) Using a library of database methods. This approach provides what is known as an application programming interface (API) for accessing a database from applications programs
  • c) Embedded SQL. Embeding database commands in a general-purpose programming language. A preprocessor extracts the embedded SQL from the source code and replaces it with function calls to DBMS-generated code.
  • d) Embedded SQL. Embeding database commands in a specific-purpose programming language. A preprocessor can not extract code, but function calls to be extracted to DBMS-generated code.
  • e) Designing a new database programming language.
  • f) Embedded SQL. Embeding database commands in a specific-purpose programming language. A preprocessor extracts the embedded SQL from the source code and replaces it with function calls to DBMS-generating code

Pregunta 27

Pregunta
29. In XML _____ defines the set of commands (names) that can be used
Respuesta
  • a) Namespace
  • b) Valid
  • c) Document
  • d) Invalid

Pregunta 28

Pregunta
30. In XML schema, the tag _____ is used tospecify primary keys.
Respuesta
  • a) xs:element
  • b) xsd:key
  • c) psd:schema
  • d) xs:sequence

Pregunta 29

Pregunta
31. A * following an element name means the element can be repeated zero or one times (an optional, single-valued, nonrepeating elements)
Respuesta
  • True
  • False

Pregunta 30

Pregunta
32. If an XML document is well-formed and follows a particular schema, it is _____
Respuesta
  • a) Namespace
  • b) Keys
  • c) Invalid
  • d) Valid

Pregunta 31

Pregunta
33. The XML schema, it is possible to specify constraints that correspond to unique and primary key constraints ina relational database, as well as foreign keys constraints
Respuesta
  • True
  • False

Pregunta 32

Pregunta
34. An element that does not have *, +, or ? following the element name means the element must appear exactly once in the document (a required, single-valued, nonrepeating element).
Respuesta
  • True
  • False

Pregunta 33

Pregunta
35. A ? following an element name means that element can be repeated zero or more times in the document (an optional, mult-valued, repeating element).
Respuesta
  • True
  • False

Pregunta 34

Pregunta
36. The basic object in XML is the XML document, which is structured using types and iterators.
Respuesta
  • True
  • False

Pregunta 35

Pregunta
37. How does a well-formed XML document look like?
Respuesta
  • a) It is syntactically correct: a non-single root element with every element including a matching pair of start/end tags within the start-end of the parent element
  • b) It must finish with an XML declaration to indicate the version of XML.
  • c) It is syntactically correct: a single root element with every element including a matching pair of start/end tags within the start-end tags of the parent element
  • d) It is syntactically correct: a single root element with every element except a matching pair of start/end tags within the start-end tags of the parent elements
  • e) It must start with an XML declaration to indicate the version of XML

Pregunta 36

Pregunta
38. Struct type constructors include the set (T), list (T), bag(T), array(T), and dictionary (K,T) type constructors.
Respuesta
  • True
  • False

Pregunta 37

Pregunta
39. Three major differences between the relational and object database design.
Respuesta
  • a) In ODB design a binary relationship can be declared in one direction or both. If attributes are included in both directions, there is a potential problem with redundancy.
  • b) In ODB design a binary relationship can be declared in one direction or both. If attributes are included in both directions, there is no any problem
  • c) In an ODB, operations must be defined early since they are part of the classes specifications. In RDBs, operations may not be defined until implementation
  • d) In RDB inheritance is built into the model; ODBs do not have built-in constructs for inheritance.
  • e) In an RDB, operations must be defined early since they are part of the class specifications. In an ODB, operations may not be defined until implementation
  • f) In ODB inheritance is built into the model; RDBs do not have built-in constructs for inheritance.

Pregunta 38

Pregunta
40. The typical mechanisms for making an object an object persistent are naming and reachability.
Respuesta
  • True
  • False

Pregunta 39

Pregunta
41. The main property required of an OID is that it be immutable (should not change).
Respuesta
  • True
  • False

Pregunta 40

Pregunta
42. _____ inheritance occurs when a subtype inherits only some of the functions of a supertype.
Respuesta
  • a) Generalisation
  • b) Complete encapsulation
  • c) Conditional
  • d) Selective

Pregunta 41

Pregunta
43. In operator overloading (or polymorphism), an operation name may refer to several distinct implementations, depending on the type of object it is applied to.
Respuesta
  • True
  • False

Pregunta 42

Pregunta
44. In ______ all operations that can be applied to an object must be predefined.
Respuesta
  • a) Half encapsulation
  • b) Complete encapsulation
  • c) Object identifier
  • d) Feedback loop

Pregunta 43

Pregunta
45. The implementation of an operation is called its signature.
Respuesta
  • True
  • False

Pregunta 44

Pregunta
46. A subtype is used when a new type is needed that is similar but not identical to an already defined type.
Respuesta
  • True
  • False

Pregunta 45

Pregunta
47. The dictionary constructor creates a collection of two tupes (K,V) where the value of a key K can be used to retrieve the can be used to retrieve the corresponding value V.
Respuesta
  • True
  • False

Pregunta 46

Pregunta
48. An ODMS provides a unique identity to each independent object in the database via a unique, system-generated ____.
Respuesta
  • a) Selective
  • b) Complete encaplsulation
  • c) Object identifier

Pregunta 47

Pregunta
49. An object typically has three components: state, timing, and behavior
Respuesta
  • True
  • False

Pregunta 48

Pregunta
50. The 80-20 rule suggests that 80% of the workload is presented by 20% of the most frequently used transactions, which govem the physical database design.
Respuesta
  • True
  • False

Pregunta 49

Pregunta
51. The phases (or activities) of the life cycle are not strictly in sequence; ______ are common among and within the phases of the life cycle.
Respuesta
  • a) One-shot
  • b) Requirements collection
  • c) Feedback loop
  • d) View integration

Pregunta 50

Pregunta
52. In the _____ approach to schema design, a scheme is designed for each user group or application based phase, these schemas are merged into a global conecptual schema.
Respuesta
  • a) Requirements analysis
  • b) Feedback loops
  • c) Feasibility analysis
  • d) One-shot
  • e) View integration

Pregunta 51

Pregunta
53. A large database typically has large transaction volumes and rates, is used in service sector industries, and runs 24/7
Respuesta
  • True
  • False

Pregunta 52

Pregunta
54. Many organizations use data dictionary systems (information repositories) to manage meta-data, i.e., data that describes the database structure, constraints, applications, authorizations, users, and so forth.
Respuesta
  • True
  • False

Pregunta 53

Pregunta
55. What are the three goals of database design?
Respuesta
  • a) Satisfy the information content requirements of the generalised users and applications.
  • b) Support result
  • c) Support processing requirements and any performance objectives.
  • d) Provide a natural and easy-to-understand structuring of the information.
  • e) Satisfy the information content requirements ofthe specified users and applications.
  • f) Provide a comlicated structuring of the information.

Pregunta 54

Pregunta
56. _______ involves interacting with potential users and user groups to identify their particular problems and needs.
Respuesta
  • a) view-integration
  • b) requirements collection and analysis
  • c) feasibility analysis
  • d) one-shot
  • e) feedback loop

Pregunta 55

Pregunta
57. A transaction processing system can be characterized as one with several dozen gigabytes of data and a schema with more than 30 or 40 distinct entity types
Respuesta
  • True
  • False

Pregunta 56

Pregunta
58. Identify the three criteria to guide the choice of physical database design options
Respuesta
  • a) Space utisilation
  • b) Availability of vendor services
  • c) Transaction throughput
  • d) Response time
  • e) Familiarity of personnel with the system

Pregunta 57

Pregunta
59. Identify the three factors to consider in choosing one DBMS over another
Respuesta
  • a) Space utisilation
  • b) Organization-wide adoption of a certain philosophy (data model, vendor, methodology, tools)
  • c) Availability of vendor services
  • d) Transaction throughput
  • e) Response time
  • f) Familiarity of personnel with the system

Pregunta 58

Pregunta
60. _____ is concerned with analyzing potential application areas, identifying the economics of information gathering and dissemination, performing preiliminary cost-benefit studies, determining the complexity of data and processes, and setting up priorities among applications.
Respuesta
  • a) Feasibility analysis
  • b) Requirements collection and analysis
  • c) View integration
  • d) One-shot
  • e) Feedback loops

Pregunta 59

Pregunta
61. The initial requirements can be expected to be formal, complete, consistent, and correct.
Respuesta
  • True
  • False

Pregunta 60

Pregunta
62. In the ______ schema design approach, the requirements from the different stakeholders are merged into a single set of requirements before the schema design begins.
Respuesta
  • a) Requirements collection
  • b) Feedback loop
  • c) Centralized (or one-shot)
  • d) Requirements analysis

Pregunta 61

Pregunta
63. What two things does minimizing redundancy imply?
Respuesta
  • a) Reducing the need for multiple updates to maintain consistency across multiple copies of the same information.
  • b) Reducing the redundant information in tuples.
  • c) Making sure the semantics of the attributes is clear in the schema
  • d) Minimizing redundant storage of the same information
  • e) Disallowing the possibility of generating spurious tuples

Pregunta 62

Pregunta
64. Third normal form (3NF): R is 2NF and all non-prime attributes are transively dependent on the primary key.
Respuesta
  • True
  • False

Pregunta 63

Pregunta
65. First normal from (1NF): the domain of an attribute must include only atomic (simple, indivisible, scalar) values and the value of any attribute ina tuple must be a single value from the domain of that attribute.
Respuesta
  • True
  • False

Pregunta 64

Pregunta
66. A functional dependency is a property of the relation schema R not of a particular legal relation state r or R, therefor it must understands the semantics of the attributes of R.
Respuesta
  • True
  • False

Pregunta 65

Pregunta
67. Second normal form (2NF): R is 1NF and every non-prime attribute A in R is fully functionally dependent on the primary key of R
Respuesta
  • True
  • False

Pregunta 66

Pregunta
68. What are four informal guidelines that may be used to measure the quality of a relation schema design?
Respuesta
  • a) Reducing the need for multiple updates to maintain consistency across multiple copies of the same information.
  • b) Disallowing the possibility of generating spurious tuples.
  • c) Reducing the redundant information in tuples
  • d) Reducing the NULL values in tuples
  • e) Making sure the semantics of the attributes is clear in the schema
  • f) Minimizing redundant storage of the same information

Pregunta 67

Pregunta
69. Normalization of data can be considered a process of analyzing the given relation schemas based on their functional dependencies and primary keys to achieve closure on the domain space
Respuesta
  • True
  • False

Pregunta 68

Pregunta
71. When mapping a binary M:N relationship type R, create a new relation S to represent R, including as foreign key attributes in S the primary keys of the relations that are the perticipating entity types (their combination in S is the composite primary key of S).
Respuesta
  • True
  • False

Pregunta 69

Pregunta
The symbol σ (sigma) is used to denote the SELECT operator in the relational algebra
Respuesta
  • True
  • False

Pregunta 70

Pregunta
A EQUIJOIN uses any of the comparison operators =, <, ≤, >, ≥, or ≠.
Respuesta
  • True
  • False

Pregunta 71

Pregunta
The symbol π (pi) is used to denote the PROJECT operation in the relational algebra.
Respuesta
  • True
  • False

Pregunta 72

Pregunta
78. A THETA JOIN uses the comparison operator =
Respuesta
  • True
  • False

Pregunta 73

Pregunta
80. SQL is both a data definition language (DDL) and a data manipulation language (DML).
Respuesta
  • True
  • False

Pregunta 74

Pregunta
81. A key uniquely identifies a tuple in a relation.
Respuesta
  • True
  • False

Pregunta 75

Pregunta
82. When the DELETE operation violates a contraint, the deletion must be rejected.
Respuesta
  • True
  • False

Pregunta 76

Pregunta
83. Semantic integrity constarint may be enforced using mechanisms called triggers and assertions.
Respuesta
  • True
  • False

Pregunta 77

Pregunta
84. If a multi-table query refers to two or more attributes with the same name, we must qualify the attribute name with the table name, e.g., TABLE.Attribute, to prevent ambiguity.
Respuesta
  • True
  • False

Pregunta 78

Pregunta
85. A relation schema may only have one key.
Respuesta
  • True
  • False

Pregunta 79

Pregunta
86. Tuples in a relation are ordered.
Respuesta
  • True
  • False

Pregunta 80

Pregunta
88. The DELETE operation can violate referential integrity.
Respuesta
  • True
  • False

Pregunta 81

Pregunta
89. The INSERT operation can violate domain constraints, key constraints, entity integrity, or referential integrity.
Respuesta
  • True
  • False

Pregunta 82

Pregunta
90. The theortical basis of the relation data model is set theory and first-order predicate logic.
Respuesta
  • True
  • False

Pregunta 83

Pregunta
92. Attributes that represent the same real-world concept must have identical names in different relations.
Respuesta
  • True
  • False

Pregunta 84

Pregunta
93. When the INSERT operation violates a constraint, the default option is to reject the insertion.
Respuesta
  • True
  • False

Pregunta 85

Pregunta
94. Attributes must have unique domains.
Respuesta
  • True
  • False

Pregunta 86

Pregunta
95. NULL values may mean value unknown, value exits but is not available, attribute does not apply to this tuple (value undefined).
Respuesta
  • True
  • False

Pregunta 87

Pregunta
96. All tuples in a relation must be distinct.
Respuesta
  • True
  • False

Pregunta 88

Pregunta
102. The $d->query function takes an SQL command as its string argument and sends it to the database server for execution.
Respuesta
  • True
  • False

Pregunta 89

Pregunta
103. The _____ is a collection of several libraries of functions for enhancing PHP.
Respuesta
  • a) DBMS
  • b) PHP Extension and Application Repository (PEAR)
  • c) MYSQL
  • d) PHP SQL

Pregunta 90

Pregunta
104. The _____ variable is similar to cursor and iterator variables.
Respuesta
  • a) $d->query
  • b) post
  • c) $r

Pregunta 91

Pregunta
105. The abend function can be used to terminate a PHP program if there is an error.
Respuesta
  • True
  • False

Pregunta 92

Pregunta
106. The PHP function $d->nextID creates a sequence of unique values for a particular table.
Respuesta
  • True
  • False

Pregunta 93

Pregunta
115. The ___________ R S keeps tuple in the first {left} relation R; if no matching tuple found in S, then the attribute of S in the join are filled with NULL values
Respuesta
  • o LEFT OUTER JOIN
  • o RIGHT OUTER JOIN
  • o FULL OUTER JOIN
  • o LEFT INNER JOIN

Pregunta 94

Pregunta
116. If a relation schema has more than one key, each is called a _______ key.
Respuesta
  • o Candidate
  • o Primary
  • o Public
  • o Foreign

Pregunta 95

Pregunta
117. A ¬¬¬_________conflict arises when an attribute may have different domains in two schemas, e.g. pounds vs kilograms
Respuesta
  • o Domain
  • o Type
  • o Norming
  • o Constraints

Pregunta 96

Pregunta
119. Objects in an object-oriented programming language exist only during program execution, therefore they are called transient objects; an object-oriented database can extend the existence of objects so that they are stored permanently, therefore they are called
Respuesta
  • o persistent object
  • o instance variable
  • o attribute
  • o object structure

Pregunta 97

Pregunta
120. __________________ is the term used to refer to the problems that occur because of difference between the database model and the programming language model.
Respuesta
  • o Independence mismatch
  • o Denormalisation
  • o Redundancy
  • o Duplication

Pregunta 98

Pregunta
121. A __________________ is typically used to loop over the tuples in a query result
Respuesta
  • o Cursor {iterator variable}
  • o Shared variable
  • o Communication variables
  • o fetch

Pregunta 99

Pregunta
122. NULL values may mean value unknown, value exists but isn't available, and attribute does not apply to this tuple (value undefined)
Respuesta
  • True
  • False

Pregunta 100

Pregunta
123. A THETA JOIN uses any of the comparison operators =,<,>
Respuesta
  • True
  • False

Pregunta 101

Pregunta
124. For structured data, the schema information is mixed in with the data values, so it is sometimes referred to as self-describing data.
Respuesta
  • True
  • False

Pregunta 102

Pregunta
125. The main advantage of using a function call interface is that it makes it easier to access multiple databases within the same application program
Respuesta
  • True
  • False

Pregunta 103

Pregunta
126. In PHP, Interpolating variables may occur within double-quoted or single-quoted strings
Respuesta
  • True
  • False

Pregunta 104

Pregunta
127. In PHP, the $d->query function takes an SQL command as its string argument and sends it to the database server for execution.
Respuesta
  • True
  • False

Pregunta 105

Pregunta
128. The ________________ property ensures that either all the database operations in a transaction are executed or none are
Respuesta
  • o Atomicity
  • o Transaction
  • o Isolation
  • o Concurrency

Pregunta 106

Pregunta
129. ____________________occurs when the same data is stored multiple times
Respuesta
  • o Redundancy
  • o Normalisation
  • o Denormalization
  • o Persistent

Pregunta 107

Pregunta
130. Creating a database design that only stores each logical data item in only one place is the database is called______________________.
Respuesta
  • o Redundancy
  • o Normalization
  • o Denormalization
  • o Persistent

Pregunta 108

Pregunta
131. When a database design is in ____________, each value in a tuple is in atomic value.
Respuesta
  • o First normal form
  • o Second normal form
  • o Third normal form
  • o Forth normal form

Pregunta 109

Pregunta
132. An entity cannot exist in a database merely by being a member of a subclass, it must also be a member of the superclass
Respuesta
  • True
  • False

Pregunta 110

Pregunta
133. An entity that is a member of a subclass may inherit one, some, or all the attributes of the entity as a member of the superclass.
Respuesta
  • True
  • False

Pregunta 111

Pregunta
134. The ________________ property allows several users to update the same data in a controlled manner so that result of the updates is correct
Respuesta
  • o Atomicity
  • o Transaction
  • o Isolation
  • o Concurrency

Pregunta 112

Pregunta
The theoretical basis of the relational data model is set theory and first-order predicate logic
Respuesta
  • True
  • False

Pregunta 113

Pregunta
Semantic integrity constraints may be enforced using mechanisms called triggers and assertions.
Respuesta
  • True
  • False

Pregunta 114

Pregunta
When mapping a binary M:N relationship type R, create a new relation S to represent R, including as foreign key attributes in S the primary keys of the relations that are the participating entity types (their combination in S is the composite primary key of S).
Respuesta
  • True
  • False

Pregunta 115

Pregunta
$_SESSION − An associative array containing session variables available to the current script.
Respuesta
  • True
  • False

Pregunta 116

Pregunta
PHP makes use of mail() function to send an email. This function requires three mandatory arguments that specify the recipient's email address, the subject of the the message and the actual message additionally there are other two optional parameters.
Respuesta
  • True
  • False

Pregunta 117

Pregunta
The interpreter identifies variable names within double-quoted strings by their initial character $ and replaces them with the value in the variable. This is known as interpolating variables within strings. Interpolation does not occur in single-quoted strings
Respuesta
  • True
  • False

Pregunta 118

Pregunta
SQLJ was developed after JDBC, which is used for accessing SQL data- bases from Java using function calls
Respuesta
  • True
  • False

Pregunta 119

Pregunta
Most NoSQL databases support automatic __________, meaning that you get high availability and disaster recovery
Respuesta
  • <text>processing</text>
  • <text>scalability</text>
  • <text>replication</text>
  • <text>All of the mentioned</text>

Pregunta 120

Pregunta
The Web Services Architecture supports interaction between a service provider, service requestor, and service registry.
Respuesta
  • True
  • False

Pregunta 121

Pregunta
Multi-line PHP comments start with // and end with #.
Respuesta
  • True
  • False

Pregunta 122

Pregunta
Define types of abstractions by the relations as "A is <u>made of/composed of</u> B,C,D"
Respuesta
  • Classification
  • Aggregation
  • Generalization
  • Specialization

Pregunta 123

Pregunta
FETCH commands are issued in the program; each FETCH moves the cursor to the next row in the result of the query, making it the cur- rent row and copying its attribute values into the C (host language) program variables specified in the FETCH command by an INTO clause.</text>
Respuesta
  • True
  • False

Pregunta 124

Pregunta
Define types of abstractions by the relations as "B,C,D are special cases of A"
Respuesta
  • Classification
  • Aggregation
  • Generalization
  • Specialization

Pregunta 125

Pregunta
A JDBC driver is basically an implementation of the function calls specified in the JDBC application programming interface (API) for a particular vendor's RDBMS.
Respuesta
  • True
  • False

Pregunta 126

Pregunta
In PHP, a numeric array associates a numeric index with each element in the array.
Respuesta
  • True
  • False

Pregunta 127

Pregunta
Before being able to process JDBC function calls with Java, it is necessary to import the JDBC class libraries, which are called java.sql.*.
Respuesta
  • True
  • False

Pregunta 128

Pregunta
How can you change "Hansen" into "Nilsen" in the "LastName" column in the Persons table?
Respuesta
  • • UPDATE Persons SET LastName='Hansen' WHERE LastName='Nilsen'
  • • UPDATE Persons SET LastName='Nilsen' WHERE LastName='Hansen'
  • • MODIFY Persons SET LastName='Hansen' WHERE LastName='Nilsen'
  • • UPDATE FROM Persons SET LastName='Nilsen' WHERE LastName='Hansen'

Pregunta 129

Pregunta
Publisher table contains id and name columns. Id is auto incremented and name is of varchar(40) type. Which of the following queries will execute NOT correctly?
Respuesta
  • INSERT INTO Publisher (name) values ('O'Reilly');
  • INSERT INTO Publisher (name) values ('O Reilly');
  • INSERT INTO Publisher (name) values ('OReilly');
  • INSERT INTO Publisher (name) values ('O-Reilly');

Pregunta 130

Pregunta
What is the correct order of clauses for a proper SQL query?
Respuesta
  • SELECT, FROM, WHERE, GROUP BY, HAVING, ORDER BY
  • SELECT, FROM, WHERE, GROUP BY, ORDER BY, HAVING
  • SELECT, FROM, GROUP BY, WHERE, HAVING, ORDER BY
  • SELECT, FROM, WHERE, HAVING, GROUP BY, ORDER BY

Pregunta 131

Pregunta
Which clause indicates the table(s) from which data is to be retrieved?
Respuesta
  • FROM
  • SELECT
  • WHERE
  • GROUP BY
  • HAVING

Pregunta 132

Pregunta
161. Which clause is executed first in a SQL query?
Respuesta
  • WHERE
  • SELECT
  • FROM
  • ON

Pregunta 133

Pregunta
162. Which of the following DROP statements is INCORRECT?
Respuesta
  • • DROP DATABASE
  • • DROP ROW
  • • DROP INDEX
  • • DROP TABLE

Pregunta 134

Pregunta
163. Which of the following is NOT a language element of SQL?
Respuesta
  • Expression
  • Data mining
  • Query
  • Statement
  • Clause

Pregunta 135

Pregunta
Which operator is used to search for a specified pattern in a column?
Respuesta
  • WHERE
  • LIKE
  • ALIASE
  • PATTERN

Pregunta 136

Pregunta
165. Which operator is used to select values within a range?
Respuesta
  • RANGE
  • AND
  • BETWEEN
  • OR

Pregunta 137

Pregunta
With SQL, how can you delete the records where the "Address" is "Almaty" in the Student Table?
Respuesta
  • • DROP ROW Student ='Almaty' FROM Address
  • • DELETE FROM Student ROW Address ='Almaty'
  • • DROP ROW Address ='Almaty' FROM Student
  • • DELETE ROW Address ='Almaty' FROM Student

Pregunta 138

Pregunta
166. Which term is used to describe data organized in rows and columns?
Respuesta
  • Query
  • Program
  • Index
  • Table

Pregunta 139

Pregunta
With SQL, how can you return all the records from a table named "Persons" sorted descending by "FirstName"?
Respuesta
  • • SELECT * FROM Persons GROUP BY FirstName DESC
  • • SELECT * FROM Persons WHERE FirstName DESC
  • • SELECT * FROM Persons ORDER BY FirstName
  • • SELECT * FROM Persons ORDER BY FirstName DESC

Pregunta 140

Pregunta
169. With SQL, how can you return the number of records in the "Employee" table?
Respuesta
  • • SELECT COUNT(*) FROM Employee
  • • SELECT * FROM Employee GROUP BY
  • • SELECT NUM(*) FROM Employee
  • • RETURN COUNT(*) FROM Employee

Pregunta 141

Pregunta
170. With SQL, how do you select all the records from a table named "Persons" where the value of the column "FirstName" starts with an "a"?
Respuesta
  • • SELECT * FROM Persons WHERE FirstName LIKE 'a%';
  • • SELECT * FROM Persons WHERE FirstName LIKE '%a%';
  • • SELECT All FROM Persons WHERE FirstName LIKE='a';
  • • SELECT * FROM Persons WHERE FirstName LIKE 'a*';

Pregunta 142

Pregunta
171. With SQL, how do you select all the records from a table named "Persons" where the "FirstName" is "Alma" and the "LastName" is "Alimova"?
Respuesta
  • • SELECT * FROM Persons WHERE FirstName=' Alma ' AND LastName=' Alimova'
  • • SELECT * FROM Persons WHERE FirstName=' Alma ' OR LastName=' Alimova'
  • • SELECT FROM Persons WHERE FirstName=' Alma ' AND LastName=' Alimova'
  • • SELECT * FROM Persons HAVING FirstName=' Alma ' AND LastName=' Alimova'

Pregunta 143

Pregunta
Which of the following is not a NoSQL database ?
Respuesta
  • SQL Server
  • MongoDB
  • Cassandra
  • None of the mentioned

Pregunta 144

Pregunta
Which of the following is a NoSQL Database Type ?
Respuesta
  • SQL
  • Document databases
  • JSON
  • All of the mentioned

Pregunta 145

Pregunta
Which of the following is a wide-column store ?
Respuesta
  • Cassandra
  • Riak
  • MongoDB
  • Redis

Pregunta 146

Pregunta
An ODMS provides a unique identity to each independent object stored in the database via a unique, system-generated ________________
Respuesta
  • <text>object identifier (OID)</text>
  • <text>literals</text>
  • <text>indirect pointer</text>
  • <text>constructor</text>

Pregunta 147

Pregunta
Define types of abstractions by the relations as "A is a <u>member of</u> class B
Respuesta
  • <text>Classification</text>
  • <text>Aggregation</text>
  • <text>Generalization</text>
  • <text>Specialization</text>

Pregunta 148

Pregunta
Define types of abstractions by the relations as "B <u>is-an</u> A, C <u>is-an</u> A, D <u>is-an</u> A"
Respuesta
  • Classification
  • Aggregation
  • Generalization
  • Specialization

Pregunta 149

Pregunta
How will you close a MySql database using PHP?
Respuesta
  • mysql_destroy
  • mysql_exit
  • mysql_end
  • mysql_close

Pregunta 150

Pregunta
How will you concatenate two strings?
Respuesta
  • Using . operator
  • Using + operator
  • Using add() function
  • Using append() function

Pregunta 151

Pregunta
How will you connect a MySql database using PHP?
Respuesta
  • mysql_connection
  • mysql_query
  • mysql_fetch_array
  • mysql_connect

Pregunta 152

Pregunta
How will you destroy a session in PHP?
Respuesta
  • session_destroy()
  • destroy_session()
  • $_SESSION['destroy']
  • $_SESSION['']

Pregunta 153

Pregunta
How will you start a session in PHP?
Respuesta
  • <text>session_start()</text>
  • <text>start_session()</text>
  • <text>$_SESSION['start']</text>
  • <text>$_SESSION['']</text>

Pregunta 154

Pregunta
How will you unset a single session variable?
Respuesta
  • <text><![CDATA[<?phpunset($_SESSION['counter']);?>]]></text>
  • <text><![CDATA[<?phpisset($_SESSION['counter']); ?>]]></text>
  • <text>$_SESSION['unset']</text>
  • <text>$_SESSION['']</text>

Pregunta 155

Pregunta
Identify factors to consider in choosing one DBMS over another. I. Organization-wide adoption of a certain philosophy (data model, vendor, methodology, tools). I. Familiarity of personnel with the system. III. Availability of vendor services.
Respuesta
  • • <text>I, II</text>
  • • <text>I, II, III</text>
  • • <text>II, III</text>
  • • <text>I, III</text>

Pregunta 156

Pregunta
• In which type of PHP arrays the element values can be strings or integers?
Respuesta
  • • <text>numeric</text>
  • • <text>associative</text>
  • • <text>indexed</text>
  • • <text>none</text>

Pregunta 157

Pregunta
• In XML schema, the tag ________________ is used to specify foreign keys
Respuesta
  • • <text>xsd:keyref</text>
  • • <text>xsd:element</text>
  • • <text>xsd: unique</text>
  • • <text>xsd:foreignkey</text>

Pregunta 158

Pregunta
• NoSQL databases is used mainly for handling large volumes of ______________ data
Respuesta
  • unstructured
  • structured
  • semi-structured
  • all of the mentioned

Pregunta 159

Pregunta
• Point out the wrong statement
Respuesta
  • Non Relational databases require that schemas be defined before you can add data
  • NoSQL databases are built to allow the insertion of data without a predefined schema
  • NewSQL databases are built to allow the insertion of data without a predefined schema
  • All of the mentioned

Pregunta 160

Pregunta
• The ___ notation applies to user-defined subclasses of a specialization that must be ________, as illustrated by the specialization "every STUDENT must be either an GRADUATE_STUDENT, or a UNDERGRADUATE_STUDENT"
Respuesta
  • • <text>d, disjoint</text>
  • • <text>j, joint</text>
  • • <text>o, overlapping</text>
  • • <text>u, union</text>

Pregunta 161

Pregunta
• 190. The case of specialization what the same (real-world) entity may be a member of more than one subclass of the specialization for example, an alumnus may also be an employee and may also be a student pursuing an advanced degree (PERSON entity type, which is specialized into the subclasses {EMPLOYEE, ALUMNUS, STUDENT})
Respuesta
  • • <text> disjoint</text>
  • • <text> joint</text>
  • • <text>overlapping</text>
  • • <text>union</text>

Pregunta 162

Pregunta
• The case represents a single superclass/subclass relationship with more than one superclass, where the superclasses represent different entity types
Respuesta
  • • <text> disjoint</text>
  • • <text> joint</text>
  • • <text>overlapping</text>
  • • <text>union</text>

Pregunta 163

Pregunta
• This auto-global built-in array variable which provides the IP (Internet Protocol) address of the client user computer that is accessing the server, for example 129.107.61.8.
Respuesta
  • • <text>$_SERVER['SERVER_NAME']</text>
  • • <text>$_SERVER['REMOTE_ADDRESS']</text>
  • • <text>$_SERVER['REMOTE_HOST'] 
</text>
  • • <text>$_SERVER['PATH_INFO'] 
</text>
  • • <text>$_SERVER['QUERY_STRING']</text>

Pregunta 164

Pregunta
• This auto-global built-in array variable which provides the part of the URL address that comes after a backslash (/) at the end of the URL.
Respuesta
  • • <text>$_SERVER['SERVER_NAME']</text>
  • • <text>$_SERVER['REMOTE_ADDRESS']</text>
  • • <text>$_SERVER['REMOTE_HOST'] 
</text>
  • • <text>$_SERVER['PATH_INFO'] 
</text>

Pregunta 165

Pregunta
• This auto-global built-in array variable which provides the string that holds parameters in a URL after a question mark (?) at the end of the URL. This can hold search parameters, for example.
Respuesta
  • • <text>$_SERVER['SERVER_NAME']</text>
  • • <text>$_SERVER['QUERY_STRING']</text>
  • • <text>$_SERVER['REMOTE_ADDRESS']</text>
  • • <text>$_SERVER['PATH_INFO'] 
</text>

Pregunta 166

Pregunta
• This auto-global built-in array variablewhich provides the Web site name of the server computer where the PHP interpreter is running.
Respuesta
  • • <text>$_SERVER['SERVER_NAME']</text>
  • • <text>$_SERVER['REMOTE_ADDRESS']</text>
  • • <text>$_SERVER['REMOTE_HOST'] 
</text>
  • • <text>$_SERVER['PATH_INFO'] 
</text>

Pregunta 167

Pregunta
• What does PHP stands for
Respuesta
  • • <text>Personal Hypertext Processor</text>
  • • <text>PHP: Hypertext Preprocessor</text>
  • • <text>Private Home Page</text>
  • • <text>Private Hypertext Preprocessor</text>

Pregunta 168

Pregunta
• What does S in BASE refers to?
Respuesta
  • • <text>System Consistence</text>
  • • <text>System Availability</text>
  • • <text>Changing System</text>
  • • <text>System Stability</text>

Pregunta 169

Pregunta
• [What does the term "I" expands to in the term "ACID"?
Respuesta
  • • <text>Isolated</text>
  • • <text>Inseparable</text>
  • • <text>Indispensable</text>
  • • <text>Insulted</text>

Pregunta 170

Pregunta
• What does XML stand for?
Respuesta
  • • <text>eXtensible Markup Language</text>
  • • <text>Example Markup Language</text>
  • • <text>X-Markup Language</text>
  • • <text>eXtra Modern Link</text>

Pregunta 171

Pregunta
• What does XSL stand for?
Respuesta
  • • <text>eXtensible Stylesheet Language</text>
  • • <text>eXtra Style Language</text>
  • • <text>eXpandable Style Language</text>
  • • <text>eXtensible Style Listing</text>

Pregunta 172

Pregunta
• What is the correct syntax of the declaration which defines the XML version?
Respuesta
  • • <?xml version="1.0" />
  • • <?xml version="1.0"?>
  • • <xml version="1.0" />

Pregunta 173

Pregunta
• Which company did Cassandra was primarily developed in?
Respuesta
  • • <text>Apache</text>
  • • <text>Facebook</text>
  • • <text>Google</text>
  • • <text>Amazon</text>

Pregunta 174

Pregunta
• Which feature of CAP refers to load balancing
Respuesta
  • None of these
  • C
  • P
  • A

Pregunta 175

Pregunta
• Which of the following is correct about PHP
Respuesta
  • Key-value
  • Wide-column
  • Document
  • All of the mentioned

Pregunta 176

Pregunta
• Which of the following is correct about PHP
Respuesta
  • • PHP is a recursive acronym for "PHP: Hypertext Preprocessor".]
  • • PHP is a server side scripting language that is embedded in HTML
  • • It is used to manage dynamic content, databases, session tracking, even build entire e-commerce sites
  • • All of these statement

Pregunta 177

Pregunta
• Which of the following is correct about variable naming rules?
Respuesta
  • • Variable names must begin with a letter or underscore character
  • • A variable name can consist of numbers, letters, underscores.
  • • A variable name can consist of numbers, letters, underscores. you cannot use characters like + , - , % , ( , ) . &amp; , etc in a variable name.
  • • All of these statement

Pregunta 178

Pregunta
• Which of the following is not a NoSQL database?
Respuesta
  • • <text>SQL Server</text>
  • • <text>MongoDB</text>
  • • <text>Cassandra</text>
  • • <text>None of the mentioned</text>.

Pregunta 179

Pregunta
• Which of the following method can be used to create a MySql database using PHP?
Respuesta
  • • <text>mysql_connect()</text>
  • • <text>mysql_query()</text>
  • • <text>mysql_close()</text>
  • • <text>None of the above</text>

Pregunta 180

Pregunta
• Which of them could not be applied to techniques for looping through arrays in PHP
Respuesta
  • • $courses = ('Database', 'OS', 'Graphics', 'Data Mining');
  • • $courses = array('Database', 'OS', 'Graphics', 'Data Mining');
  • • $teaching = array('Database' => 'Smith', 'OS' => 'Carrick', 'Graphics' => 'Kam');
  • • $teaching['Graphics'] = 'Benson';

Pregunta 181

Pregunta
• A key difference between structured and semistructured data concerns how the schema constructs (such as the names of attributes, relationships, and entity types) are handled.
Respuesta
  • True
  • False

Pregunta 182

Pregunta
• A large database typically has large transaction volumes and rates, is used in service sector industries, and runs 24/7
Respuesta
  • True
  • False

Pregunta 183

Pregunta
• A library of functions, also known as an application programming interface (API), is used to access the database
Respuesta
  • True
  • False

Pregunta 184

Pregunta
• A safer way to do inserts and other queries is through the use of placeholders (specified by the ? symbol) in PHP
Respuesta
  • True
  • False

Pregunta 185

Pregunta
• Associative array − An array with strings as index. This stores element values in association with key values rather than in a strict linear index order.
Respuesta
  • True
  • False

Pregunta 186

Pregunta
• In SQLJ, an iterator is a type of object associated with a collection (set or multiset) of records in a query result.
Respuesta
  • True
  • False

Pregunta 187

Pregunta
• In SQLJ, embedded SQL commands are preceded by #sql.
Respuesta
  • True
  • False

Pregunta 188

Pregunta
• In XML schema, it is possible to specify constraints that correspond to unique and primary key constraints in a relational database, as well as foreign keys constraints.
Respuesta
  • True
  • False

Pregunta 189

Pregunta
• Interfaces are defined to provide a common function names to the implementers. Different implementers can implement those interfaces according to their requirements. You can say, interfaces are skeletons which are implemented by developers.
Respuesta
  • True
  • False

Pregunta 190

Pregunta
• Numeric array − An array with a numeric index. Values are stored and accessed in linear fashion.
Respuesta
  • True
  • False

Pregunta 191

Pregunta
• OPEN CURSOR command is issued to indicate that we are done with processing the result of the query associated with that cursor.
Respuesta
  • True
  • False

Pregunta 192

Pregunta
• PHP is written in C and usually comes installed with Unix; for other operating systems, the PHP interpreter can be downloaded from http://www.php.net.
Respuesta
  • True
  • False

Pregunta 193

Pregunta
• The cursor is declared when the SQL query command is declared in the program. Later in the program, an OPEN CURSOR command fetches the query result from the database and sets the cursor to a position before the first row in the result of the query.
Respuesta
  • True
  • False

Pregunta 194

Pregunta
• The typical mechanisms for making an object persistent are naming and reachability
Respuesta
  • True
  • False

Pregunta 195

Pregunta
• The typical mechanisms for making an object persistent are naming and reachability
Respuesta
  • True
  • False

Pregunta 196

Pregunta
• XML attribute values must always be enclosed in quotes
Respuesta
  • True
  • False

Pregunta 197

Pregunta
• XML elements cannot be empty
Respuesta
  • True
  • False

Pregunta 198

Pregunta
• XML's goal is to replace HTML
Respuesta
  • True
  • False

Pregunta 199

Pregunta
• XQuery is the language for querying XML data
Respuesta
  • True
  • False

Pregunta 200

Pregunta
• What are the advantages and disadvantages of the embedded SQL approach.
Respuesta
  • • The main advantage is the query text is part of the source code can be checked for syntax errors and validated against the database schema at compile time. The program is quite readable. Since queries are known in advance, the choice of program variables to hold query results is simple.
  • • The main advantage is flexibility in generating queries at runtime. Also, the library of function calls approach is able to call multiple data program.
  • • The main disadvantage is the query text is part of the source code can be checked for syntax errors and validated against the database schema at compile time. The program is quite readable. Since queries are known in advance, the choice of program variables to hold query results is simple.
  • • Disadvantage are more complex programming, inability to do checking at compile time, and concerns about SQL runtime errors.
  • • Disadvantage are the loss of flexibility in changing the query the query at runtime and that all changes to queries must be recompiled.
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