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 SQL COUNT function is an aggregate functionthat returns the number of rows returned by a query. For example, you can use the COUNT function in the SELECT statementto get the number of employees, the number of employees in each department, the number of employees who hold a specific job, etc. The following illustrates the syntax of the SQL COUNT...
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