Mike Rykowski wrote:
> I have a query:
> select * from table where del != "1";
> Let's assume that I have a record where del is null (del is a single
> character field).
> In version 3.23.22-beta I get the record returned with the above query,
> in version 4.1.10a I get nothing returned.
> Did something change between these versions or is this a bug? I
> couldn't find anything specific to this on the archives.
You should get nothing returned. NULL is not a value, so it cannot be
equal, *or not equal*, to anything. The result of NULL != 1 is NULL.
NULL is not TRUE, so no rows where del is NULL should be returned. If
3.23.222-beta returned such rows, it was a bug in that ancient version
which has since been fixed.
If you want rows where del is null, you need to
SELECT * FROM table WHERE del IS NULL;