STDEVP (T-SQL)

Returns the statistical standard deviation for the population for all values in the given expression.

Syntax

STDEVP(expression)

Arguments

expression: Is a numeric expression. Aggregate functions and subqueries are not permitted. expression is an expression of the exact numeric or approximate numeric data type category, except for the bit data type.

Return Types

float

Remarks

If STDEVP is used on all items in a SELECT statement, each value in the result set is included in the calculation. STDEVP can be used with numeric columns only. Null values are ignored.

Examples

This example returns the standard deviation for the population for all royalty values in the titles table.

USE pubs

SELECT STDEVP(royalty)