STDDEV

STDDEV returns the sample standard deviation of expression, a set of numbers.

Syntax

STDDEV ( [DISTINCT | ALL ] expression) OVER (window_clause)

Remarks

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STDDEV differs from STDDEV_SAMP in that STDDEV returns zero when it has only 1 row of input data, whereas STDDEV_SAMP returns NULL.

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Without a window clause, STDDEV is a simple aggregate function. Refer Window Clause