Selecting date column from a table

hi
I have a problem that looks wierd for me.
I have a table called blog_post which has a date field called publish_date
I have done this first.
alter session set nls_date_format='dd/mm/yyyy';
then
SQL> select publish_date from blog_post;
PUBLISH_DA
09/07/2007
02/07/2007
02/07/2007
02/07/2007
09/07/2007
now the wierd thing is that when i am selectin the same date it is not returning anything
SQL> select publish_date from blog_post where publish_date='09/07/2007';
no rows selected
Thanks for any help.
Ganesh

I don't know anything about Hibernate, but the reason why you need to specify the trunc(publish_date) = to_date('09/07/2007','dd/mm/yyyy') is because of the way that Oracle stores date/time internally.
It's labelled as a date field, but the time is automatically stored as well. So, if you're just wanting to compare the date to another date, you need to ignore the time part of the column - the trunc function does this.
As for the "to_date(<date>, <date mask>)", well, you want to compare a date to a date, not a string. You could rely on the implicit conversion, governed by the nls settings, but I really, really, really wouldn't. In fact, I can't stress enough how much of a bad idea that would be! It's best to make things explicit.

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