Slow query

From: <JayK_at_ibsplc.com>
Date: Tue, 04 Mar 2003 22:33:50 -0800
Message-ID: <F001.00560401.20030304223350@fatcity.com>

Dear all,

Please find below the 2 queries :

select dep_date from test_date1
where to_char(dep_date,'dd-mon-yyyy') = '12-jan-2002'

select dep_date from test_date1
where TRUNC(dep_date) = to_DATE( '12-jan-2002','dd-mon-yyyy')

The execution plan for both the queries shows a FTS on test_date1.

Execution Plan

---

   0 SELECT STATEMENT Optimizer=CHOOSE    1 0 SORT (AGGREGATE)
   2 1 TABLE ACCESS (FULL) OF 'TEST_DATE1' The number of rows to be retrieved are 120010.

The first query took 10msec to execute whereas the second took about 2 secs.

Could anyone help me figure out what the problem would be.

TIA Best Regards
Jai
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Author:
  INET: JayK_at_ibsplc.com

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