sql - Optimizing a SELECT with sub SELECT query in Oracle -

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select id,        (select sum(totalpay)            table2 t           t.id = a.id              , t.transamt > 0             , t.paydt between trunc(sysdate-0-7) , trunc(sysdate-0-1)) pay   table1

in spite of having indexes on transamt, paydt , id, cost of sub-query on table2 expensive , requires full table scan.

can sub-query optimized in other way? please help.

try this:

select a.id,        pay.totalpay   table1        (select t.id, sum(totalpay) totalpay           table2 t           t.transamt > 0             , t.paydt between trunc(sysdate-0-7) , trunc(sysdate-0-1)          group t.id        ) pay  a.id = pay.id

push group joining columns (id column in example) subquery calculate results values in table2 , join table1 table. in original query calculate result every crow table1 table reading full table2 table.


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