## Aggregate Functions DBMS Questions And Answers

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### Aggregate Functions DBMS Questions & Answers

1. Aggregate Functions DBMS are functions that take a ___________ as input and return a single value.

### Aggregate Functions DBMS 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 DBMS Questions & Answers

3. All Aggregate Functions DBMS except _____ ignore null values in their input collection.

### Aggregate Functions DBMS Questions & Answers

4. A Boolean data type that can take values true, false, and________ .

### Aggregate Functions DBMS 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 DBMS 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 DBMS Questions & Answers

7. We can test for the nonexistence of tuples in a subquery by using the _____ construct.