How to avoid use of to_date and to_char ?

Question

Hi All,
I have table 'sample ' with columns id (number ) and dte (timestamp ) .
CREATE TABLE SAMPLE ( ID NUMBER,DTE TIMESTAMP);
Sample Records like
INSERT INTO SAMPLE VALUES( 1,SYSDATE);
INSERT INTO SAMPLE VALUES( 2,SYSDATE);
INSERT INTO SAMPLE VALUES( 3,SYSDATE+1);
INSERT INTO SAMPLE VALUES( 4,SYSDATE+1);
INSERT INTO SAMPLE VALUES( 5,SYSDATE+3);
After inserting the records the dte will have both date and time.....
My Question is, How to fetch the records for the given date ( not time ) without using to_date,to_char or trunc functions from the table .
For Example,
select * from sample where dte = '22-OCT-2008' ;
Note : '22-OCT-2008' is not exactly a string ,use it as date datatype.
Regards,
Hariharan ST

Answer 1

Pavan Kumar wrote:
Hi,
strange Requirements, try to use substr
SELECT Id , SUBSTR(dte,1,10) FROM SAMPLE
No ! That doesn't give any garuantee about the result !
SQL> select created,substr(created,1,10) from dba_users;
CREATED           SUBSTR(CREATED,1,10)
20030527 14:12:47 20030527 1
20030527 14:12:47 20030527 1
20030527 14:12:52 20030527 1
20030527 14:20:54 20030527 1
20030527 14:32:36 20030527 1
20070124 16:59:58 20070124 1
20080811 15:08:13 20080811 1
20080929 10:52:04 20080929 1
20070827 15:16:18 20070827 1
20030818 15:41:05 20030818 1
20030527 14:32:40 20030527 1
CREATED           SUBSTR(CREATED,1,10)
20040301 07:04:46 20040301 0
20060830 14:14:25 20060830 1
13 rows selected.Don't use string function against date. Use the proper session parameter setting NLS_DATE_FORMAT as well. And work properly with the date format mask.
Nicolas.