Where in clause vs. between clause with date conditions

Question

Hi Forum.
I am struggling with two different query structures and wonder why one is more costly than the other one. Does anybody have any idea?
Query a) Total Cost: 188. Bytes 511,966. Cardinality: 2,639
Query b) Total Cost: 112. Bytes 511,966. Cardinality: 2,639
Example:
Query a) select * from table where trunc(date_time) between to_date('10/12/2011','DD/MM/YYYY') and to_date('20/12/2011','DD/MM/YYYY') and XYZ_ID = 007
Query b) select * from table where trunc(date_time)
in (
to_date('10/12/2011','DD/MM/YYYY') ,
to_date('11/12/2011','DD/MM/YYYY'),
to_date('12/12/2011','DD/MM/YYYY'),
to_date('13/12/2011','DD/MM/YYYY'),
to_date('14/12/2011','DD/MM/YYYY'),
to_date('15/12/2011','DD/MM/YYYY'),
to_date('16/12/2011','DD/MM/YYYY'),
to_date('17/12/2011','DD/MM/YYYY'),
to_date('18/12/2011','DD/MM/YYYY') ,
to_date('19/12/2011','DD/MM/YYYY') ,
to_date('20/12/2011','DD/MM/YYYY')
and XYZ_ID = 007
-The table has local index on date_time and XYZ_ID
-The table is partitioned like:
PARTITION VALUES LESS THAN (TIMESTAMP' 2011-12-16 00:00:00')
PARTITION VALUES LESS THAN (TIMESTAMP' 2011-12-17 00:00:00')
etc.
-Database: 11gR1
If any other information needed, please ask for it.
Thanks for this discussion!
- Ugur-
Edited by: user11384454 on 23.12.2011 04:56

Answer 1

Hi,
user11384454 wrote:
I am struggling with two different query structures and wonder why one is more costly than the other one. Does anybody have any idea?
Query a) select * from table where trunc(date_time) between to_date('10/12/2011','DD/MM/YYYY') and to_date('20/12/2011','DD/MM/YYYY') and XYZ_ID = 007
Query b) select * from table where trunc(date_time)
in (
to_date('10/12/2011','DD/MM/YYYY') ,
to_date('11/12/2011','DD/MM/YYYY'),
to_date('12/12/2011','DD/MM/YYYY'),
to_date('13/12/2011','DD/MM/YYYY'),
to_date('14/12/2011','DD/MM/YYYY'),
to_date('15/12/2011','DD/MM/YYYY'),
to_date('16/12/2011','DD/MM/YYYY'),
to_date('17/12/2011','DD/MM/YYYY'),
to_date('18/12/2011','DD/MM/YYYY') ,
to_date('19/12/2011','DD/MM/YYYY') ,
to_date('20/12/2011','DD/MM/YYYY')
and XYZ_ID = 007Because your 2 queries are functionnaly different.
Query A would retrieve rows where date_time=to_date('10/12/2011 11:23:45','DD/MM/YYYY HH24:MI:SS') where the query B wouldn't.