Returns the statistical variance for the population for all values in the given expression.
VARP(expression)
float
If VARP is used on all items in a SELECT statement, each value in the result set is included in the calculation. VARP can be used with numeric columns only. Null values are ignored.
This example returns the variance for the population for all royalty values in the titles table.
USE pubs
SELECT VARP(royalty)
FROM titles