Re: Empty Output? How Do I Determine the Character?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Hunter Hillegas <lists(at)lastonepicked(dot)com>
Cc: PostgreSQL <pgsql-general(at)postgresql(dot)org>
Subject: Re: Empty Output? How Do I Determine the Character?
Date: 2003-08-08 23:08:54
Message-ID: 1846.1060384134@sss.pgh.pa.us
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Hunter Hillegas <lists(at)lastonepicked(dot)com> writes:
> I ran the query you suggested but I don't know what it means:
> thedonnaholics=# select '>' || state || '<' from mailing_list where rec_num
> = 7;
> ?column?
> ----------

> (1 row)

It means it's NULL. (Hint: foo = NULL is not the same as foo IS NULL.)

regards, tom lane

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