On Monday 20 January 2003 08:22, Octavian Rasnita wrote:
> But I don't want to perform a 15 - id, meaning 15 - 10.
> I want to calculate 5 - id, meaning 5 - 10.
>
> It should give me -5 or 5 but not | 18446744073709551611 |
The result of the above expression is UNSIGNED, because column 'id' is INT
UNSIGNED. If you want to get -5, use CAST() function in v4.0:
mysql> select CAST(5 - id AS SIGNED) from test;
+------------------------+
| CAST(5 - id AS SIGNED) |
+------------------------+
| -5 |
+------------------------+
1 row in set (0.00 sec)
or in 3.23 you can do:
mysql> select 5 - (id+0.0) from test;
+--------------+
| 5 - (id+0.0) |
+--------------+
| -5.0 |
+--------------+
1 row in set (0.00 sec)
For more info look at:
http://www.mysql.com/doc/en/Cast_Functions.html
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