Counts the number of rows in a group depending on the specified parameters.
COUNT( * | expression | DISTINCT expression )
COUNT( { * | expression } ) OVER ( window-spec )
window-spec : see Syntax 2 instructions in the Remarks section below
* 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.
INT
Rows where the value is the NULL value are not included in the count.
Syntax 2 represents usage as a window function in a SELECT statement. As such, elements of window-spec can be specified either in the function syntax (inline), or in conjunction with a WINDOW clause in the SELECT statement. See the window-spec definition provided in WINDOW clause.
For more information about using window functions in SELECT statements, including working examples, see Window functions.
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; |
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