Aggregate Functions Questions And Answers
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Aggregate Functions Questions & Answers
1. Aggregate functions are functions that take a ___________ as input and return a single value.
Aggregate Functions Questions & Answers
2. Select __________ from instructor where dept name= ’Comp. Sci.’;Which of the following should be used to find the mean of the salary ?
Aggregate Functions Questions & Answers
3. All aggregate functions except _____ ignore null values in their input collection.
Aggregate Functions Questions & Answers
4. A Boolean data type that can take values true, false, and________ .
Aggregate Functions Questions & Answers
5. Select count (____ ID)
from teaches
where semester = ’Spring’ and year = 2010;
If we do want to eliminate duplicates, we use the keyword ______in the aggregate expression.
Aggregate Functions Questions & Answers
6. The ____ connective tests for set membership, where the set is a collection of values produced by a select clause. The ____ connective tests for the absence of set membership.
Aggregate Functions Questions & Answers
7. We can test for the nonexistence of tuples in a subquery by using the _____ construct.
