correlated subquery - How to reference and reuse a corelated sub query? -


imagine trade table , cds_coupon table joined on trade id; coupon table having settlement date , settlement amount well. required query amount , date of next coupon settle.

    select t.tradeid tradeid, (   select settlement_date cds_coupon e    t.tradeid=e.tradeid    , e.settlement_date = (select min(settlement_date) cds_coupon ei ei.tradeid = t.tradeid  , ei.settlement_date > sysdate ) )  settlement_date, (    select settlement_amount cds_coupon e    t.tradeid=e.tradeid    , e.settlement_date = (select min(settlement_date) cds_coupon ei ei.tradeid = t.tradeid , ei.settlement_date > sysdate ) )  settlement_amount,     trade t

as can seen 2 levels of identical corelation done twice grab different field - once grab settlement date , once grab settlement amount. hence question - how reference , reuse corelated sub query ?

if using sql server use common table expression (cte).

;with settlementdates () (     select tradeid, min(settlement_date) settlement_date     cds_coupon       settlement_date > sysdate     group tradeid )  select e.trade_id, e.settlement_date, e.settlement_amount cds_coupon e join settlementdates sd      on (e.trade_id = sd.trade_id)    , (e.settlement_date = sd.settlement_date)

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