sql - Calculate average cost correctly after purchase or delete purchase? -


i have table table_transactions in table when inserting or deleted update 2 tables itemremains , ref_items column averagecost.

example data formula  avgcost = (currentqty*currentavgcost+new.qty+new.amt)/(currentqty+new.qty) 1)purchase itema - 10units - 10$  = itemremains qty=10 ref_items avgcost=10  2)sale itema - 4units - 25$  = itemremains qty=6 ref_items avgcost=10  3)purchase itema - 10units - 15$  = itemremains qty=16 ref_items avgcost=13,13 4)purchase itema - 10units - 20$ = itemremains qty=26 ref_items avgcost=15,77

my questions how return or calculate if delete 1 of purchase? if delete purchase

3)purchase itema - 10units - 15$  = itemremains qty=20 ref_items avgcost=13,13

trigger work after inserting or deleting on table table_transactions trigger code

declare variable current_qty d_qty; declare variable current_cost d_amt; declare variable new_cost d_amt; begin  if (inserting)   begin    current_qty  =0;    current_cost =0;    new_cost     =0;         select sum(coalesce(qty,0))     goodsremains    goodsid=:new.gdsid          :current_qty;    select coalesce(gdsavgcost,0)     tgoods    gdsid=:new.gdsid          :current_cost;      if (exists(select goodsid goodsremains goodsid = :new.gdsid , storeid = :new.storeid , boxnumber = :new.gdscod))         begin             update goodsremains                    set goodsremains.qty = goodsremains.qty + :new.rgstritemqty * :new.transtype                         goodsremains.goodsid   = :new.gdsid                                , goodsremains.boxnumber = :new.gdscod                                , goodsremains.storeid   = :new.storeid;   end   else   begin     insert goodsremains (         goodsid,         storeid,         boxnumber,         qty)         values (:new.gdsid,:new.storeid,:new.gdscod,:new.rgstritemqty * :new.transtype);   end    new_cost = (:current_qty*:current_cost+:new.rgstritemqty*:new.rgtritempurchamt)/(:new.rgstritemqty+:current_qty);      update tgoods      set gdsavgcost=:new_cost    gdsid=:new.gdsid;  end else if (deleting)    begin          current_qty  =0;      current_cost =0;      new_cost     =0;       select sum(coalesce(qty,0))     goodsremains    goodsid=:old.gdsid          :current_qty;    select coalesce(gdsavgcost,0)     tgoods    gdsid=:old.gdsid          :current_cost;       update goodsremains         set goodsremains.qty = goodsremains.qty - :old.rgstritemqty * :old.transtype       goodsremains.goodsid   = :old.gdsid         , goodsremains.boxnumber = :old.gdscod         , goodsremains.storeid   = :old.storeid;             new_cost = ((:current_qty-:old.rgstritemqty * :old.transtype)*:current_cost-:old.rgstritemqty*:old.rgtritempurchamt)/:current_qty+:old.rgstritemqty;      update tgoods      set gdsavgcost=:new_cost    gdsid=:old.gdsid;    end


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