VAR_POP() OVER ...

All functions > WINDOW FUNCTION > VAR_POP() OVER ...

Returns the population variance over the window frame.

Syntax

VAR_POP(expr) OVER ([PARTITION BY expr [, ...]] [ORDER BY sort_item [, ...]] [ROWS|RANGE|GROUPS frame])

VAR_POP(expr) OVER ([PARTITION BY expr [, ...]] [ORDER BY sort_item [, ...]] [ROWS|RANGE|GROUPS frame])

Notes

• Computes population variance (divides by N) over a window of rows
• NULL values are ignored in the calculation

See also

• OVER clause

Examples

SELECT
    f1 := ZIP(ARRAY[10, 20, 30] AS id, ARRAY[1.0E0, 2.0E0, 3.0E0] AS x).TRANSFORM(SELECT VAR_POP(x) OVER (ORDER BY id ASC)).UNWRAP() -- Variance of x in the frame (id is only the sort key, not part of the aggregate)
;