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Aggregate Functions DBMS
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We can test for the nonexistence of tuples in a subquery by using the _____ construct
Exist
NOT EXISTS
EXISTS
Not exist
The ____ connective tests for set membership, where the set is a collection of values produced by a selectclause.
The ____ connective tests for the absence of set membership
Not in, in
In, or
In, not in
Or, in
Select __________ from instructor where dept name= ’Comp.
Sc
i.’;Which of the following should be used to find the mean of the salary
Count(salary)
Mean(salary)
Sum(salary)
Avg(salary)
Select count (____ ID)from teacheswhere semester = ’Spring’ and year = 2010;If we do want to eliminate duplicates, we use the keyword ______in the aggregate expression
Count
Avg
Primary key
Distinct
Aggregate functions are functions that take a ___________ as input and return a single value
Collection of values
Aggregate value
Single value
Both A & B
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