REGR_SYY
REGR_SYY makes the following computation after the elimination of NULL expression1-expression2 pairs:
REGR_COUNT (expression1, expression2) * VAR_POP (expression1)
Syntax
REGR_SYY (expression, expression) OVER (window_clause)
Remarks
• Without a window clause, REGR_SYY is a simple aggregate function.