Re: Null vs. Empty String in Postgres 8.3.8

"Wang, Mary Y" <mary.y.wang@boeing.com> writes:
> Can someone provide a link to the Postgres 8.x documentation that provides information about Null vs. Empty String?
> Here is the situation:
> Currently,  the source code performs the following SQL statement :
> UPDATE user_group set subversion_flags='' WHERE user_id='5818' AND group_id='438';
> (This SQL statement worked in a very old version of Postgres)
> and pgsql 8.3.8 returned ERROR:  invalid input syntax for integer: ""

You were not getting a NULL there.  You were getting an integer zero,
as a result of sloppy input checking in the integer-input routine.

            regards, tom lane