Web Reference: SQL Aggregate Functions An aggregate function is a function that performs a calculation on a set of values, and returns a single value. Aggregate functions are often used with the GROUP BY clause of the SELECT statement. Mar 23, 2026 · An aggregate function in the Microsoft SQL Database Engine performs a calculation on a set of values, and returns a single value. Except for COUNT(*), aggregate functions ignore NULL values. The AVG() function returns the average values in a set. The following illustrates the syntax of the AVG()function: The ALL keyword instructs the AVG() function to calculate the average of all values while the DISTINCT keyword forces the function to operate on distinct values only. By default, the ALLoption is used. The following example shows how t...
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