| From: | Michael Fuhr <mike(at)fuhr(dot)org> |
|---|---|
| To: | Daniel Afonso Heisler <daniel(at)solis(dot)coop(dot)br> |
| Cc: | pgsql-bugs(at)postgresql(dot)org |
| Subject: | Re: BUG #2178: NOT IN command don't work |
| Date: | 2006-01-19 21:40:42 |
| Message-ID: | 20060119214042.GA15276@winnie.fuhr.org |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-bugs |
On Tue, Jan 17, 2006 at 10:00:28PM +0000, Daniel Afonso Heisler wrote:
> When i run the following query, postgreSQL return TRUE.
> # SELECT true WHERE 1 NOT IN (2,3);
>
> But, when i run the next query, it don't return TRUE
> # SELECT true WHERE 1 NOT IN (2,NULL,3);
The expression "1 NOT IN (2,NULL,3)" evaluates to NULL because NULL
means "unknown." This comes up occasionally; see the archives for
past discussion.
http://archives.postgresql.org/pgsql-sql/2005-12/msg00219.php
http://archives.postgresql.org/pgsql-sql/2005-10/msg00227.php
--
Michael Fuhr
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Bruce Momjian | 2006-01-19 21:55:26 | Re: BUG #2177: (minor:) pgsql: Trailing semicolon on \d treated |
| Previous Message | Tom Lane | 2006-01-19 21:37:27 | Re: BUG #2180: log_statement=mod does not work |