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Editorial Team
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Asked: 2026-05-22T12:04:19+00:00

such as: select country from table1 inner join table2 on table1.id=table2.id where table1.name=’a’ and

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such as:

select country 
  from table1 
 inner join table2 on table1.id=table2.id
 where table1.name='a' and table2.name='b'
 group by country

after the parse, which part will be executed first?

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1 Answer

  1. Editorial Team

    It looks like you want to know the execution plan chosen by Oracle. You can get that ouput from Oracle itself:

    set serveroutput off
< your query with hint "/*+ gather_plan_statistics */" inserted after SELECT >
select * from table(dbms_xplan.display_cursor(null, null, 'last allstats'));

    See here for an explanation how to read a query plan: http://download.oracle.com/docs/cd/E11882_01/server.112/e16638/ex_plan.htm#i16971

    Be aware however that the choice of a query plan is not fixed. Oracle tries to find the currently best query plan, based on available statistics data.

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