-------- Original Message --------
Subject: Re: MySQL Conditional Trigger
From: Chris <dmagick@xxxxxxxxx>
To: OKi98 <oki98@xxxxxxxxxx>
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.
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