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SELECT c.orderid, b.sum_qty
FROM vw_order_list c CROSS JOIN
(SELECT SUM(psi_stock_in.qty) AS sum_qty
FROM psi_stock_in
WHERE psi_stock_in.itemcode = c.itemcode) b
SELECT c.orderid ,
b.sum_qty
FROM vw_order_list c
LEFT JOIN ( SELECT itemcode ,
SUM(qty) AS sum_qty
FROM psi_stock_in
GROUP BY itemcode
) b ON c.itemcode = b.itemcode
SELECT c.orderid, b.sum_qty
FROM vw_order_list c CROSS JOIN
(SELECT itemcode,SUM(qty) AS sum_qty
FROM psi_stock_in
group by itemcode
) b
where b.itemcode = c.itemcode