Re: Need help to rewrite sql statement to improve performance

i think this should help. let me know...

select count(*)
from (Select 1

      FROM EMP_TABLE
     where hire_date is not null
       and work_date is not null)

could be wrong. your aggregation is now performed on a smaller subset.

>
> From: mike mon <mccdba_at_yahoo.com>
> Date: 2003/04/23 Wed PM 12:01:40 EDT
> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> Subject: Need help to rewrite sql statement to improve performance
>
> We have SQL statement use "is NOT null" and this sql
> statement use 2.5 million memory I/O. Does their has
> way to improve it? Thanks.
>
> select count(*) FROM EMP_TABLE
> where hire_date is not null
> and work_date is not null
> ~
>
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