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COUNT function [Aggregate]

Counts the number of rows in a group depending on the specified parameters.

COUNT(
*
| expression
| DISTINCT expression
)

*    Return the number of rows in each group.

expression    The expression for which to return the number of rows.

DISTINCT expression    The expression for which to return the number of distinct rows.

Rows where the value is the NULL value are not included in the count.

• AVG function [Aggregate]
• SUM function [Aggregate]

• SQL/2003    Core feature. Syntax 2 is feature T611.

The following statement returns each unique city, and the number of rows with that city value.

SELECT City , COUNT(*) FROM Employees GROUP BY City;