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
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