also use VARIANCE(), which is equivalent but\nis not standard SQL.\n\nIf there are no matching rows, or if expr is NULL, VAR_POP() returns\nNULL.\n\nThis function executes as a window function if over_clause is present.\nover_clause is as described in\nhttps://dev.mysql.com/doc/refman/8.0/en/window-functions-usage.html.\n\nURL: https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html\n\n','','https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html');