Hello Evert,
i actually do not know and don't have access to a 4.1 Machine. What you
could try is to use the alternative way of testing if a value is NULL:
Maybe the behavior of IS NULL has been changed in 5.0 .
DELETE FROM table1 WHERE condition1='A' AND condition2<=>NULL
Greets
Rocco
Evert wrote:
I'm using MySQL 4.1.21 (on Gentoo). Should this make any difference?
Regards,
Evert
Rocco wrote:
Hello Evert,
i just entered your example and had no unusal behaviour on MySQL 5.0:
mysql> describe table1;
+------------+------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+------------+------------+------+-----+---------+-------+
| condition1 | char(1) | YES | | NULL | |
| condition2 | tinyint(4) | YES | | NULL | |
+------------+------------+------+-----+---------+-------+
2 rows in set (0.00 sec)
mysql> SELECT * FROM table1;
+------------+------------+
| condition1 | condition2 |
+------------+------------+
| A | NULL |
| A | NULL |
| A | NULL |
| B | NULL |
| C | NULL |
+------------+------------+
5 rows in set (0.00 sec)
mysql> SELECT count(*) as counter from table1 WHERE condition1='A'
and condition2 IS NULL;
+---------+
| counter |
+---------+
| 3 |
+---------+
1 row in set (0.00 sec)
mysql> DELETE FROM table1 WHERE condition1='A' AND condition2 IS NULL;
Query OK, 3 rows affected (0.00 sec)
mysql> SELECT * FROM table1;
+------------+------------+
| condition1 | condition2 |
+------------+------------+
| B | NULL |
| C | NULL |
+------------+------------+
2 rows in set (0.00 sec)
Maybe check again the Table definition. There is nothing wrong with
with Queries you have posted in your message.
Greets
Rocco
Evert wrote:
Hi!
I'm entering the statements exactly as listed in my message (only
done a search/replace on table-name).
So SELECT says there are 2 records, but then DELETE does not see
those same 2 records... :-/
Is there something like a verbose/debug mode in which I can see more
precise why my DELETE doesn't work?
Regards,
Evert
Aleksandar Bradaric wrote:
Hi,
Query OK, 0 rows affected (0.00 sec)
It did not find/delete any rows - please double-check your
conditions and make sure you are using the same set as for
the SELECT statement.
Best regards,
Aleksandar
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