Database Systems Practice Tests

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The MCQ: *Second extended relational-algebra operation is;* "Algebra Operations in DBMS" App Download (Free) with answers: Aggregate operation; Embedded operations; Generalized operation; Extended operation; to learn database certification courses. Practice Algebra Operations in DBMS Quiz Questions, download Google e-Book (Free Sample) for online computer science schools.

*Aggregate functions can operate over multiple occurrences of a value, known to be*

- multisets
- multidata
- multivalue
- multirelation

a

*The second extended relational-algebra operation is the*

- Aggregate operation
- Embedded operations
- Generalized operation
- Extended operation

a

*The operations with the ability to express queries that cannot be expressed by the basic relational-algebra operations, is known as*

- Compound relational-algebra
- Composite relational-algebra
- Embedded relational-algebra
- Extended relational-algebra

d

*The aggregate function that returns the number of the elements in the collection is known as*

- total
- count
- whole
- combine

b

*The operation that takes both the left and right outer join operations, is known as*

- Whole outer join
- Full outer join
- Natural outer join
- Combination outer join

b

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