| From: | Mathieu Arnold <mat(at)mat(dot)cc> |
|---|---|
| To: | pgsql-general(at)postgresql(dot)org |
| Subject: | strange behaviour |
| Date: | 2001-02-25 12:37:15 |
| Message-ID: | 5.0.2.1.2.20010225133146.00a08080@wheresmymailserver.com |
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| Thread: | |
| Lists: | pgsql-general |
Hi
could someone explain this to me :
sympa=> select count(*) from subscriber_table;
count
-------
14029
sympa=> select count(*) from subscriber_table where bounce_subscriber =
NULL;
count
-------
14024
sympa=> select count(*) from subscriber_table where bounce_subscriber <> NULL;
count
-------
0
sympa=> select count(*) from subscriber_table where bounce_subscriber = '';
count
-------
0
sympa=> select count(*) from subscriber_table where bounce_subscriber <> '';
count
-------
5
I was thinking that "= NULL" and "<> NULL" were oposite and that "<> NULL"
would give me the result i had with "<> ''" or am I mistaken ?
--
Mathieu Arnold
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