Where is the aggregate function used?

What is the most commonly used aggregate functions?

The following are the commonly used SQL aggregate functions:AVG() – returns the average of a set.COUNT() – returns the number of items in a set.MAX() – returns the maximum value in a set.MIN() – returns the minimum value in a set.SUM() – returns the sum of all or distinct values in a set.SQL Aggregate Functions

What is the purpose of aggregate functions in SQL?

An aggregate function in SQL performs a calculation on multiple values and returns a single value. SQL provides many aggregate functions that include avg, count, sum, min, max, etc. An aggregate function ignores NULL values when it performs the calculation, except for the count function.

WHERE aggregate functions Cannot be used?

An aggregate function cannot be used directly in: an ORDER BY clause. Attempting to do so generates an SQLCODE -73 error. However, you can use an aggregate function in an ORDER BY clause by specifying the corresponding column alias or select-item sequence number.

Can we use WHERE for aggregate function in SQL?

You cannot use aggregate functions in a WHERE clause or in a JOIN condition. However, a SELECT statement with aggregate functions in its SELECT list often includes a WHERE clause that restricts the rows to which the aggregate is applied.