RE: partitioned tables and the optimizer's behavior

Dear DBAndrey,

use :
A.> assuming start_date to be of dd/mm/yyyy select trunc(ADAY,'DD') , count(...),sum(...),... from THETABLE
where trunc(ADAY) >= :start_date /* changes done here add TRUNC function to ADAY */
group by trunc(ADAY,'DD')

B.> assuming start_date to be of dd/mm/yyyy hh24:mi select trunc(ADAY,'DD') , count(...),sum(...),... from THETABLE
where nvl(ADAY,to_date('01/01/1800 00:00','dd/mm/yyyy hh24:mi') >= :start_date /* changes done here add NVL function to ADAY */ group by trunc(ADAY,'DD')

regards,
Ams.
www.medicomsoft.com

-----Original Message-----
Sent: Monday, July 15, 2002 1:53 PM
To: Multiple recipients of list ORACLE-L

Dear list !

i have a table , which is partitioned by a date column (let's call it ADAY) Each day is a separate partition.
I have this sort of a query :
select trunc(ADAY,'DD') , count(...),sum(...),... from THETABLE
where ADAY >= :start_date
group by trunc(ADAY,'DD')

I.e. i want to perform some calculations for the last couple of days
(governed by the :start_date - passed as a parameter, not fixed).
Now , i want to force the query to perform the Full scan (not an index scan) only of the required partitions (i.e. for the required days). How can i do that , please ?

TIA DBAndrey

• 03-9254520
• 058-548133
• mailto:andreyb_at_elrontelesoft.com

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Author: Amjad
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