STDDEV_POP() OVER ...

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

Returns the population standard deviation over the window frame.

Syntax

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

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

Notes

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

See also

• OVER clause

Examples

SELECT
    f1 := ZIP(ARRAY[1,2,3] AS id, ARRAY[5.0E0,5.0E0,5.0E0] AS x).TRANSFORM(SELECT STDDEV_POP(x) OVER (ORDER BY id ASC)).UNWRAP() -- Population std dev of identical values is zero
;