>UPDATE cr_sale SET weight=SUM(crsalp.qty*crsalp.weight) from crsalp WHERE cr_sale.vou_no=crsalp.vou_no >>
UPDATE cr_sale SET weight= crsalp.TotalWeigth; FROM cr_sale; INNER JOIN (SELECT vou_no, SUM(qty*weight) AS TotalWeigth; FROM crsalp; GROUP BY vou_no) crsalp ON cr_sale.vou_no=crsalp.vou_no