STDDEV_SAMP() OVER ...

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

Returns the sample standard deviation over the window frame.

Syntax

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

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

Notes

• Computes sample standard deviation (divides by N-1) 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_SAMP(x) OVER (ORDER BY id ASC)).UNWRAP() -- Sample std dev needs at least two rows
;