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