From: | Peter Pilsl <pilsl(at)goldfisch(dot)at> |
---|---|
To: | postgres mailinglist <pgsql-general(at)postgresql(dot)org> |
Subject: | select, where and null-values (or: select null<>'1' is fuzzy) |
Date: | 2001-06-12 16:52:32 |
Message-ID: | 20010612185232.C75862@i3.atat.at |
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Thread: | |
Lists: | pgsql-general |
I've a problem when selecting values out a table.
manana=# select * from test;
l1 | l2 | l3
----+----+----
1 | 2 | 3
2 | 3 | 4
3 | 4 | 5
4 | 5 | 6
| 5 | 6
(5 rows)
where l1 is NULL in the last line.
now I do
manana=# select * from test where l1<>1;
l1 | l2 | l3
----+----+----
2 | 3 | 4
3 | 4 | 5
4 | 5 | 6
(3 rows)
and dont get the line with the null-entry !
In fact the problem is also describeable like this:
manana=# select NULL<>'1';
?column?
----------
(1 row)
This gives neither true nor false.
Why is this like this and how can I work around ?
thnx,
peter
--
mag. peter pilsl
phone: +43 676 3574035
fax : +43 676 3546512
email: pilsl(at)goldfisch(dot)at
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