sql - Convert Update statement to select statement -


i'm struggling convert following update statement select statement. hoping can provide tips on how convert this.

update inventory_part_tab set planner_buyer = (select hb.buyer_code                       info.hb_pur_plan_upd1 hb                       hb.part_no = inventory_part_tab.part_no                        , hb.contract = inventory_part_tab.contract),     last_activity_date = decode(contract, '01', to_date(sysdate), '06', (to_date(sysdate) - (3 / 24)), '20', to_date(sysdate), '21', to_date(sysdate)),     rowversion = decode(contract, '01', sysdate, '06', (sysdate-(3 / 24)), '20', sysdate, '21', sysdate, '12', (sysdate + (6 / 24))) contract in ('01', '06', '20', '21')   , prime_commodity not in ('spcsl','spckt','spccc','spcgk','spcmt')   , planner_buyer <> (select hb.buyer_code                          info.hb_pur_plan_upd1 hb                          hb.part_no = inventory_part_tab.part_no                           , hb.contract = inventory_part_tab.contract)   , exists (select *                info.hb_pur_plan_upd1 hb                hb.part_no = inventory_part_tab.part_no                  , hb.contract = inventory_part_tab.contract); commit; 

update <tablename> set <fieldname> = <value> <conditons>

would 

select (<value>) <fieldname <tablename> <conditons>

in case <value> big subquery works same, add parenthesis.


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