Re: Test for null?

Hi Ron,

Null is not a value domain so it cannot be used to compare an attribut with.
To overcome this problem, there a predicate IS NULL with does the job.

and meetinf_date is null
André

wolfgang_at_123.com wrote:

> This ought to be easy, but I've been driving myself nuts with it...
>
> I have a select statement that goes:
>
> select template_name from agenda where group_name='"+group_ID+"' and
> meeting_date=null
>
> which gives me all template names from the given group_ID, completely
> ignoring the meeting_date field.
>
> I tried various permutations on 'null', "null", "", '', etc, but those
> would "blow up" the page --- (none of the jsp stuff would show up, as
> it was stuck in a loop)
>
> If you have a suggestion on how to select for all rows where a given
> field is null, I'd love to hear it... please e-mail that info to
> wolfgang<at>deathsdoor<dot>com
>
> (Notice to spammers: spam is not welcome)
>
> Regards,
>
> Ron
Received on Sun Apr 29 2001 - 14:11:57 CEST