Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.
UPDATE P SET p.PO_total = t.total FROM tblPO p INNER JOIN (SELECT tblPO_Details.PO_ID, SUM(tblPO_Details.subtotal) as total FROM tblPO_Details GROUP BY tblPO_Details.PO_ID) as t ON t.PO_ID = p.PO_ID
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