Compare date with time

Question

Hi ,
Oracle 10.2.0.1.0
I need to compare date field with time stamp as well . I tried doing byt getting time stamp using to_char and on convertion into date by using to_date , I'm loosing time stamp please help

Answer 1

804282 wrote:
I need to compare date field with time stamp as well Compare how exactly?
If you for example want to see if the date and timestamp are "equal", you can use the following approach - where in this specific approach it is deemed that if the difference between the timestamp and date is less than 1 sec, the two values are equal. E.g.
SQL>
SQL> create table test_tab(
  2          d       date,
  3          t       timestamp
  4  );
Table created.
SQL>
SQL> insert into test_tab values( sysdate, systimestamp );
1 row created.
SQL> --// is the date and timestamp within 1 sec of one another?
SQL> select * from test_tab where t-d <  to_dsinterval('0 0:0:1.00');
D                   T
2011/07/12 07:25:06 12/JUL/11 07:25:06.744832
SQL> --// the reverse test
SQL> select * from test_tab where t-d >=  to_dsinterval('0 0:0:1.00');
no rows selected
SQL>