6179416
Pregunta 1
Pregunta
1) _______ logic, used extensively in mathematics, provides a framework in which an assertion (statement of fact) can be verified as either true or false.
Respuesta
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A) Predicate
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B) Database
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C) Relational
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D) Index
Pregunta 2
Pregunta
2) The relational database model enables you to view data _____ rather than ____.
Respuesta
-
A) relationally, hierarchically
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B) hierarchically, relationally
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C) physically, logically
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D) logically, physically
Pregunta 3
Pregunta
3) The relational model's creator, E.F. Codd, used the term relation as a synonym for ____.
Respuesta
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A) index
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B) key
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C) table
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D) relationship
Pregunta 4
Pregunta
4) A(n) _____ is perceived as a two-dimensional structure composed of rows and columns.
Respuesta
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A) table
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B) rowset
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C) attribute
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D) intersection
Pregunta 5
Pregunta
5) Date attributes contain calendar dates stored in a special format known as the _____ date format.
Respuesta
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A) Epoch
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B) Calendar
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C) Julian
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D) Logical
Pregunta 6
Pregunta
6) ________ data can have only a true or false (yes or no) condition.
Respuesta
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A) Logical
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B) Chatacyer
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C) Date
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D) Numeric
Pregunta 7
Pregunta
7) In the relational model, _____ are important because they are used to ensure that each row in a table is uniquely identifiable.
Respuesta
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A) relations
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B) keys
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C) indexes
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D) logical structures
Pregunta 8
Pregunta
8) In the context of a database table, the statement "A ______ B" indicates that if you know the value of attribute A, you can look up the value of attribute B.
Respuesta
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A) contains
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B) is related to
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C) owns
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D) determines
Pregunta 9
Pregunta
9) The attribute B is _____ the attribute A if each value in column A determines one and only one value in column B.
Respuesta
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A) logically dependent on
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B) owned by
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C) determined by
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D) functionally dependent on
Pregunta 10
Pregunta
10) Any attribute that is part of a key is known as a _____.
Respuesta
-
A) key attribute
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B) logical attribute
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C) key determiner
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D) selector
Pregunta 11
Pregunta
11) If the attribute (B) is functionally dependent on a composite key (A) but not on any subset of that _____ key, the attribute (B) is fully functionally dependent on (A).
Respuesta
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A) foreign
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B) unique
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C) composite
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D) complete
Pregunta 12
Pregunta
12) A _____ is nay key that uniquely identifies each row.
Respuesta
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A) superkey
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B) special
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C) selective
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D) candidate
Pregunta 13
Pregunta
13) No data entry at all is known as a(n) _______.
Respuesta
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A) nil
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B) null
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C) empty
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D) Zero
Pregunta 14
Pregunta
14) Controlled _____ makes a relational database work.
Respuesta
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A) relations
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B) logic
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C) chaos
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D) redundancy
Pregunta 15
Pregunta
15) Referential _____ means that if the foreign key contains a value, that value refers to an existing valid tuple (row) in another relation.
Respuesta
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A) integrity
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B) uniqueness
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C) direction
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D) Relations
Pregunta 16
Pregunta
16) A _____ key is defined as a key that is used strictly for data retrieval purposes.
Respuesta
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A) lookup
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B_ foreign
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C) candidate
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D) Secondary
Pregunta 17
Pregunta
17) A _____ key can be described as a super key without unnecessary attributes, that is, a minimal super key.
Respuesta
-
A) secondary
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B) candidate
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C) primary
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D) Foreign
Pregunta 18
Pregunta
18) All primary key entries are unique, and no part of a primary key may be _____.
Respuesta
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A) zero
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B) a foreign key
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C) null
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D) a candidate key
Pregunta 19
Pregunta
19) A CUSTOMER table's primary key is CUS_CODE. The CUSTOMER primary key column has no null entries, and all entries are unique. This is an example of ______ integrity.
Respuesta
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A) entity
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B) referential
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C) complete
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D) Null
Pregunta 20
Pregunta
20) The ______ constraint can be placed on a column to ensure that every row in the table has a value for that column.
Respuesta
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A) HAS VALUE
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B) NOT NULL
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C) MUST HAVE VALUE
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D) NOT EMPTY
Pregunta 21
Pregunta
21) To be considered minimally relational, the DBMS must support the key relational operators _______, PROJECT, and JOIN.
Respuesta
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A) INTERSECT
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B) UNION
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C) DIFFERENCE
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D) SELECT
Pregunta 22
Pregunta
22) ______, also known as RESTRICT, yields values for all rows found in a table that satisfy a given condition.
Respuesta
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A) INTERSECT
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B) UNION
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C) DIFFERENCE
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D) SELECT
Pregunta 23
Pregunta
22) ________ yields a vertical subset of a table.
Respuesta
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A) PROJECT
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B) SELECT
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C) UNION
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D) DIFFERENCE
Pregunta 24
Pregunta
24) _______ combines all rows from two tables, excluding duplicate rows.
Respuesta
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A) INTERSECT
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B) UNION
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C) DIFFERENCE
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D) SELECT
Pregunta 25
Pregunta
25) __________ yields only the rows that appear in both tables
Respuesta
-
A) INTERSECT
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B) UNION
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C) DIFFERENCE
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D) SELECT
Pregunta 26
Pregunta
26) A(n) ________ join links tables by selecting only the rows with common values in their common attribute(s).
Respuesta
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A) equal
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B) unique
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C) foreign
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D) natural
Pregunta 27
Pregunta
27) The equijoin takes its name from the comparison operator ______ used in the condition.
Respuesta
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A) *
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B) <
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C) =
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D) >
Pregunta 28
Pregunta
28) In an outer join, the matched pairs would be retained and any unmatched values in the other table would be left ______.
Respuesta
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A) in another table
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B) null
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C) out of the results
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D) with matching values from the original table
Pregunta 29
Pregunta
29) A(n) __________ join only returns matched records from the tables that are being joined.
Respuesta
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A) outer
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B) inner
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C) direct
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D) union
Pregunta 30
Pregunta
30) A ______ contains at least all of the attribute names and characteristics for each table in the system.
Respuesta
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A) data dictionary
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B) relational schema
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C) logical schema
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D) join
Pregunta 31
Pregunta
31) The ______ is actually a system-created database whose tables store the user/designer-created database characteristics and contents.
Respuesta
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A) meta dictionary
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B) schema
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C) dictionary
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D) system catalog
Pregunta 32
Pregunta
32) In a database context, the word ______ indicates the use of the same attribute name to label different attributes.
Respuesta
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A) redundancy
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B) homonym
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C) duplicate
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D) synonym
Pregunta 33
Pregunta
33) In a database context, a(n) ________ indicates the use of different names to describe the same attribute.
Respuesta
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A) entity
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B) duplicate
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C) synonym
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D) homonym
Pregunta 34
Pregunta
34) The _____ relational type is the "relational model ideal."
Respuesta
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A) 1:1
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B) 1:M
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C) M:1
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D) M:N
Pregunta 35
Pregunta
35) The ______ relationship should be rare in any relational database design.
Respuesta
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A) 1:1
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B) 1:M
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C) M:1
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D) M:N
Pregunta 36
Pregunta
36) Since it is used to link tables that originally were related in a M:N relationship, the composite entity structure includes--as foreign keys--at least the _____ keys of the tables that are to be linked.
Respuesta
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A) composite
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B) super
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C) primary
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D) unique
Pregunta 37
Pregunta
37) Another name for a composite entity is a ______ entity.
Respuesta
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A) bridge
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B) linked
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C) directive
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D) referring
Pregunta 38
Pregunta
38) A(n) _________ is an ordered arrangement of keys and pointers.
Respuesta
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A) table
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B) superkey
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C) relationship
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D) index
Pregunta 39
Pregunta
39) When you define a table's primary key, the DBMS automatically creates a(n) ______ index on the primary key column(s) you declared.
Respuesta
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A) key
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B) incomplete
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C) unique
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D) primary
Pregunta 40
Pregunta
40) Codd's Rule of _____ states: Application programs and ad hoc facilities are logically unaffected when changes are made to the table structures that preserve the original table values (changing order of columns or inserting columns).
Respuesta
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A) Nonsubversion
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B) Logical Data Independence
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C) Comprehensive Data Sublanguage
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D) Integrity Independence
Pregunta 41
Pregunta
41) Codd's Rule of ________ states: If the system supports low-level access to the data, users must not be allowed to bypass the integrity rules of the database.
Respuesta
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A) Nonsubversion
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B) Logical Data Independence
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C) Comprehensive Data Sublanguage
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D) Integrity Independence
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