1._____ returns only the attributes requested, in the order in which they are requested.
The correct answer is: PROJECT
2.An entity is said to be _____-dependent if it can exist in the database only when it is associated with another related entity occurrence.
The correct answer is: existence
3.A _____ key can be described as a minimal superkey, a superkey without any unnecessary attributes.
The correct answer is: candidate
4.A _____ is the primary key of one table that has been placed into another table to create a common attribute.
The correct answer is: foreign key
5._____ expresses the minimum and maximum number of entity occurrences associated with one occurrence of the related entity.
The correct answer is: Cardinality
6._____, also known as RESTRICT, yields values for all rows found in a table that satisfy a given condition.
The correct answer is: SELECT
7.A _____ contains at least all of the attribute names and characteristics for each table in the system.
The correct answer is: data dictionary
8.A _____ relationship exists when three entities are associated.
The correct answer is: ternary
9.A _____ is any key that uniquely identifies each row.
The correct answer is: superkey
10._____ logic, used extensively in mathematics, provides a framework in which an assertion (statement of fact) can be verified as either true or false.
The correct answer is: Predicate
11.A derived attribute is indicated in the Chen notation by a _____ that connects the attribute and an entity.
The correct answer is: dashed line
12.A _____ attribute is one that cannot be subdivided.
The correct answer is: simple
13.A(n) _____ is the set of possible values for a given attribute.
The correct answer is: domain
14._____ are especially useful when you are trying to determine what values in related tables cause referential integrity problems.
The correct answer is: Outer joins
15.A _____ relationship exists when an association is maintained within a single entity.
The correct answer is: unary
16.A _____ attribute can be further subdivided to yield additional attributes.
The correct answer is: composite
17.A relationship is an association between _____.
The correct answer is: entities
18._____ relationships can be implemented by creating a new entity in 1:M relationships with the original entities.
The correct answer is: M:N
19.A _____ entity has a primary key that is partially or totally derived from the parent entity in the relationship.
The correct answer is: weak
20.A _____ key is defined as a key that is used strictly for data retrieval purposes.
The correct answer is: secondary
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