Aleksandar Vojnovic wrote:
You could try with the <> operator.
!=, <> Not equal operator
Same issue as using '=':
mysql> select 2 <> null;
+-----------+
| 2 <> null |
+-----------+
| NULL |
+-----------+
1 row in set (0.00 sec)
Comparing anything with null returns null. (I'm not asking for a
solution, I'm stating it as fact).
Or you could try it this way - ISNULL(col_or_data_to_check).
Example:
mysql> SELECT ISNULL(1+1);
+-------------+
| ISNULL(1+1) |
+-------------+
| 0 |
+-------------+
1 row in set (0.02 sec)
You can also use 'coalesce' to set default value for null columns.
http://dev.mysql.com/doc/refman/5.0/en/comparison-operators.html#function_coalesce
http://dev.mysql.com/doc/refman/5.0/en/working-with-null.html
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