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Мумия Фумия
Quiz por Мумия Фумия, atualizado more than 1 year ago
Мумия Фумия
Criado por Мумия Фумия mais de 5 anos atrás
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Resumo de Recurso

Questão 1

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

Questão 2

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

Questão 3

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

Questão 4

Questão
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
Responda
  • True
  • False

Questão 5

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

Questão 6

Questão
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.
Responda
  • a) Numeric
  • b) Value
  • c) String
  • d) Associative

Questão 7

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

Questão 8

Questão
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
Responda
  • True
  • False

Questão 9

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

Questão 10

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

Questão 11

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

Questão 12

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

Questão 13

Questão
13. Interpolating variables occurs only within single-quoted strings.
Responda
  • True
  • False

Questão 14

Questão
14. PHP programs are executed on the client.
Responda
  • True
  • False

Questão 15

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

Questão 16

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

Questão 17

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

Questão 18

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

Questão 19

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

Questão 20

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

Questão 21

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

Questão 22

Questão
23. Discuss advantages and diadvantages to the library of function calls approach
Responda
  • 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.

Questão 23

Questão
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
Responda
  • True
  • False

Questão 24

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

Questão 25

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

Questão 26

Questão
28. Describe the three main approaches for database programming.
Responda
  • 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

Questão 27

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

Questão 28

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

Questão 29

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

Questão 30

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

Questão 31

Questão
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
Responda
  • True
  • False

Questão 32

Questão
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).
Responda
  • True
  • False

Questão 33

Questão
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).
Responda
  • True
  • False

Questão 34

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

Questão 35

Questão
37. How does a well-formed XML document look like?
Responda
  • 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

Questão 36

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

Questão 37

Questão
39. Three major differences between the relational and object database design.
Responda
  • 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.

Questão 38

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

Questão 39

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

Questão 40

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

Questão 41

Questão
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.
Responda
  • True
  • False

Questão 42

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

Questão 43

Questão
45. The implementation of an operation is called its signature.
Responda
  • True
  • False

Questão 44

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

Questão 45

Questão
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.
Responda
  • True
  • False

Questão 46

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

Questão 47

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

Questão 48

Questão
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.
Responda
  • True
  • False

Questão 49

Questão
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.
Responda
  • a) One-shot
  • b) Requirements collection
  • c) Feedback loop
  • d) View integration

Questão 50

Questão
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.
Responda
  • a) Requirements analysis
  • b) Feedback loops
  • c) Feasibility analysis
  • d) One-shot
  • e) View integration

Questão 51

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

Questão 52

Questão
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.
Responda
  • True
  • False

Questão 53

Questão
55. What are the three goals of database design?
Responda
  • 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.

Questão 54

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

Questão 55

Questão
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
Responda
  • True
  • False

Questão 56

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

Questão 57

Questão
59. Identify the three factors to consider in choosing one DBMS over another
Responda
  • 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

Questão 58

Questão
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.
Responda
  • a) Feasibility analysis
  • b) Requirements collection and analysis
  • c) View integration
  • d) One-shot
  • e) Feedback loops

Questão 59

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

Questão 60

Questão
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.
Responda
  • a) Requirements collection
  • b) Feedback loop
  • c) Centralized (or one-shot)
  • d) Requirements analysis

Questão 61

Questão
63. What two things does minimizing redundancy imply?
Responda
  • 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

Questão 62

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

Questão 63

Questão
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.
Responda
  • True
  • False

Questão 64

Questão
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.
Responda
  • True
  • False

Questão 65

Questão
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
Responda
  • True
  • False

Questão 66

Questão
68. What are four informal guidelines that may be used to measure the quality of a relation schema design?
Responda
  • 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

Questão 67

Questão
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
Responda
  • True
  • False

Questão 68

Questão
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).
Responda
  • True
  • False

Questão 69

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

Questão 70

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

Questão 71

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

Questão 72

Questão
78. A THETA JOIN uses the comparison operator =
Responda
  • True
  • False

Questão 73

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

Questão 74

Questão
81. A key uniquely identifies a tuple in a relation.
Responda
  • True
  • False

Questão 75

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

Questão 76

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

Questão 77

Questão
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.
Responda
  • True
  • False

Questão 78

Questão
85. A relation schema may only have one key.
Responda
  • True
  • False

Questão 79

Questão
86. Tuples in a relation are ordered.
Responda
  • True
  • False

Questão 80

Questão
88. The DELETE operation can violate referential integrity.
Responda
  • True
  • False

Questão 81

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

Questão 82

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

Questão 83

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

Questão 84

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

Questão 85

Questão
94. Attributes must have unique domains.
Responda
  • True
  • False

Questão 86

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

Questão 87

Questão
96. All tuples in a relation must be distinct.
Responda
  • True
  • False

Questão 88

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

Questão 89

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

Questão 90

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

Questão 91

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

Questão 92

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

Questão 93

Questão
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
Responda
  • o LEFT OUTER JOIN
  • o RIGHT OUTER JOIN
  • o FULL OUTER JOIN
  • o LEFT INNER JOIN

Questão 94

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

Questão 95

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

Questão 96

Questão
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
Responda
  • o persistent object
  • o instance variable
  • o attribute
  • o object structure

Questão 97

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

Questão 98

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

Questão 99

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

Questão 100

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

Questão 101

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

Questão 102

Questão
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
Responda
  • True
  • False

Questão 103

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

Questão 104

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

Questão 105

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

Questão 106

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

Questão 107

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

Questão 108

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

Questão 109

Questão
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
Responda
  • True
  • False

Questão 110

Questão
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.
Responda
  • True
  • False

Questão 111

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

Questão 112

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

Questão 113

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

Questão 114

Questão
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).
Responda
  • True
  • False

Questão 115

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

Questão 116

Questão
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.
Responda
  • True
  • False

Questão 117

Questão
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
Responda
  • True
  • False

Questão 118

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

Questão 119

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

Questão 120

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

Questão 121

Questão
Multi-line PHP comments start with // and end with #.
Responda
  • True
  • False

Questão 122

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

Questão 123

Questão
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>
Responda
  • True
  • False

Questão 124

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

Questão 125

Questão
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.
Responda
  • True
  • False

Questão 126

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

Questão 127

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

Questão 128

Questão
How can you change "Hansen" into "Nilsen" in the "LastName" column in the Persons table?
Responda
  • • 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'

Questão 129

Questão
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?
Responda
  • 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');

Questão 130

Questão
What is the correct order of clauses for a proper SQL query?
Responda
  • 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

Questão 131

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

Questão 132

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

Questão 133

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

Questão 134

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

Questão 135

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

Questão 136

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

Questão 137

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

Questão 138

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

Questão 139

Questão
With SQL, how can you return all the records from a table named "Persons" sorted descending by "FirstName"?
Responda
  • • 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

Questão 140

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

Questão 141

Questão
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"?
Responda
  • • 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*';

Questão 142

Questão
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"?
Responda
  • • 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'

Questão 143

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

Questão 144

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

Questão 145

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

Questão 146

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

Questão 147

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

Questão 148

Questão
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"
Responda
  • Classification
  • Aggregation
  • Generalization
  • Specialization

Questão 149

Questão
How will you close a MySql database using PHP?
Responda
  • mysql_destroy
  • mysql_exit
  • mysql_end
  • mysql_close

Questão 150

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

Questão 151

Questão
How will you connect a MySql database using PHP?
Responda
  • mysql_connection
  • mysql_query
  • mysql_fetch_array
  • mysql_connect

Questão 152

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

Questão 153

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

Questão 154

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

Questão 155

Questão
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.
Responda
  • • <text>I, II</text>
  • • <text>I, II, III</text>
  • • <text>II, III</text>
  • • <text>I, III</text>

Questão 156

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

Questão 157

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

Questão 158

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

Questão 159

Questão
• Point out the wrong statement
Responda
  • 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

Questão 160

Questão
• 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"
Responda
  • • <text>d, disjoint</text>
  • • <text>j, joint</text>
  • • <text>o, overlapping</text>
  • • <text>u, union</text>

Questão 161

Questão
• 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})
Responda
  • • <text> disjoint</text>
  • • <text> joint</text>
  • • <text>overlapping</text>
  • • <text>union</text>

Questão 162

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

Questão 163

Questão
• 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.
Responda
  • • <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>

Questão 164

Questão
• 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.
Responda
  • • <text>$_SERVER['SERVER_NAME']</text>
  • • <text>$_SERVER['REMOTE_ADDRESS']</text>
  • • <text>$_SERVER['REMOTE_HOST'] 
</text>
  • • <text>$_SERVER['PATH_INFO'] 
</text>

Questão 165

Questão
• 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.
Responda
  • • <text>$_SERVER['SERVER_NAME']</text>
  • • <text>$_SERVER['QUERY_STRING']</text>
  • • <text>$_SERVER['REMOTE_ADDRESS']</text>
  • • <text>$_SERVER['PATH_INFO'] 
</text>

Questão 166

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

Questão 167

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

Questão 168

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

Questão 169

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

Questão 170

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

Questão 171

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

Questão 172

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

Questão 173

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

Questão 174

Questão
• Which feature of CAP refers to load balancing
Responda
  • None of these
  • C
  • P
  • A

Questão 175

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

Questão 176

Questão
• Which of the following is correct about PHP
Responda
  • • 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

Questão 177

Questão
• Which of the following is correct about variable naming rules?
Responda
  • • 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

Questão 178

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

Questão 179

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

Questão 180

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

Questão 181

Questão
• 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.
Responda
  • True
  • False

Questão 182

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

Questão 183

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

Questão 184

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

Questão 185

Questão
• 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.
Responda
  • True
  • False

Questão 186

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

Questão 187

Questão
• In SQLJ, embedded SQL commands are preceded by #sql.
Responda
  • True
  • False

Questão 188

Questão
• 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.
Responda
  • True
  • False

Questão 189

Questão
• 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.
Responda
  • True
  • False

Questão 190

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

Questão 191

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

Questão 192

Questão
• 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.
Responda
  • True
  • False

Questão 193

Questão
• 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.
Responda
  • True
  • False

Questão 194

Questão
• The typical mechanisms for making an object persistent are naming and reachability
Responda
  • True
  • False

Questão 195

Questão
• The typical mechanisms for making an object persistent are naming and reachability
Responda
  • True
  • False

Questão 196

Questão
• XML attribute values must always be enclosed in quotes
Responda
  • True
  • False

Questão 197

Questão
• XML elements cannot be empty
Responda
  • True
  • False

Questão 198

Questão
• XML's goal is to replace HTML
Responda
  • True
  • False

Questão 199

Questão
• XQuery is the language for querying XML data
Responda
  • True
  • False

Questão 200

Questão
• What are the advantages and disadvantages of the embedded SQL approach.
Responda
  • • 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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