VAR_POP() GROUP BY ...

All functions > GROUP BY > VAR_POP() GROUP BY ...

Returns the population variance of the values in the group.

Syntax

VAR_POP(expr)
 [ FILTER (WHERE condition) ]
  [ GROUP BY feature [, feature ...] ]

VAR_POP(expr)
 [ FILTER (WHERE condition) ]
  [ GROUP BY feature [, feature ...] ]

Notes

• Computes the population variance (divides by N)
• NULL values are excluded from the calculation
• Returns NULL if all values are NULL or group is empty

Examples

SELECT
    -- Population variance
    f1 := ZIP(ARRAY(1, 2, 3, 4) AS value).TRANSFORM(SELECT VAR_POP(value)).UNWRAP_ONE()
;