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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Slow query
two functions versus one maybe
-----Original Message-----
Sent: woensdag 5 maart 2003 7:34
To: Multiple recipients of list ORACLE-L
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: Jack van Zanen
INET: JACK_at_QUANTSYSTEMS.NL
Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services ---------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Wed Mar 05 2003 - 02:03:53 CST
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