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covar_samp()

Returns the sample covariance for non-null pairs in a group.

Arguments & returns

Aggregate

Overload link	`y`	`x`	Returns
#01	`DOUBLE`	`DOUBLE`	`DOUBLE`

SELECT (SUM(x*y) - SUM(x) * SUM(y) / COUNT(*)) / (COUNT(*) - 1)
FROM (VALUES
  (10, 10),
  (20, 20),
  (NULL, NULL)
) AS sample("x", "y");

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