MAX() OVER ...

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

Returns the maximum value in the window frame.

Syntax

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

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

Notes

• Finds maximum value over a window of rows
• Useful for running maximums and comparisons
• Returns same type as input expression
• NULL values are ignored in the calculation

See also

• OVER clause

Examples

SELECT
    f1 := ZIP(ARRAY[1,2,3] AS id, ARRAY[30,10,20] AS v).TRANSFORM(SELECT MAX(v) OVER (ORDER BY id ASC)).UNWRAP() -- Running maximum (v permuted so output is not the same array as v)
;