STDDEV_SAMP
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Syntax
STDDEV_SAMP(expr)
Description
Returns the sample standard deviation of expr (the square root of VAR_SAMP()).
It is an aggregate function, and so can be used with the GROUP BY clause.
STDDEV_SAMP() can be used as a window function.
STDDEV_SAMP() returns NULL if there were no matching rows.
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