-------- Original Message  --------
Subject: Re: [PHP-DB] MySQL Conditional Trigger
From: Chris <dmag...@gmail.com>
To: OKi98 <ok...@centrum.cz>
Date: 8.12.2008 23:09


anything compared to NULL is always false

Actually it's null.

mysql> select false = null;
+--------------+
| false = null |
+--------------+
|         NULL |
+--------------+
1 row in set (0.01 sec)

mysql> select 1 = null;
+----------+
| 1 = null |
+----------+
|     NULL |
+----------+
1 row in set (0.00 sec)

mysql> select 2 = null;
+----------+
| 2 = null |
+----------+
|     NULL |
+----------+
1 row in set (0.00 sec)


unknown compared to anything is unknown.

he was talking about plsql and condition evaluation (ends with true or false), your point is absolutely useless.


--
PHP Database Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php

Reply via email to