Update Values from Sum of Select Statement in SQL Server - 


        @dt tvp_api_delivery_order  readonly                 update  stkm set                     stkm.itm_qty_onhand = case                                              when tvp.flag='i' (itm_qty_onhand- (select sum(t1.orderqty) @dt t1 t1.itemcode=tvp.itemcode))                                              when tvp.flag='u' ((itm_qty_onhand+(select sum(t2.dod_qty) dod t2 t2.itm_cd=tvp.itemcode , t2.do_no=@orderno , t2.do_year=@year))-(select sum(t3.orderqty) @dt t3 t3.itemcode=tvp.itemcode))                                             when tvp.flag='d' (itm_qty_onhand + (select sum(t4.dod_qty) dod t4 t4.itm_cd=tvp.itemcode , t4.do_no=@orderno , t4.do_year=@year))                                                                                       else 0                                           end                        @dt tvp              inner join stkm on tvp.itemcode=stkm.itm_cd

how simplify above query. there other method faster execution above query? iam updating values table value parameter (tvp) table

 try way helpful you:  if found difficulty let me know.    @dt tvp_api_delivery_order  readonly                         update  stkm set                             stkm.itm_qty_onhand = case                                                      when tvp.flag='i' (itm_qty_onhand- tmporderqunatity.orderquantity)                                                      when tvp.flag='u' ((itm_qty_onhand+tmpdodqunatity.dodquantity)-tmporderqunatity.orderquantity)                                                     when tvp.flag='d' (itm_qty_onhand + tmpdodqunatity.dodquantity)                                                                                               else 0                                                   end                                @dt tvp                      inner join stkm on tvp.itemcode=stkm.itm_cd                     cross apply (                         select sum(t1.orderqty) orderquantity @dt t1                          t1.itemcode=tvp.itemcode                     )as tmporderqunatity                     cross apply (                         select sum(t2.dod_qty) dodquantity @dt t2                         t2.itemcode=tvp.itemcode , t2.do_no=@orderno , t2.do_year=@year                     )as tmpdodqunatity

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