I have a problem with CONSTRAINTs
This is what I am using:

mysql> SHOW VARIABLES LIKE "%version%";
+-------------------------+------------------------------+
| Variable_name | Value |
+-------------------------+------------------------------+
| innodb_version | 1.1.8 |
| protocol_version | 10 |
| slave_type_conversions | |
| version | 5.5.16 |
| version_comment | MySQL Community Server (GPL) |
| version_compile_machine | x86 |
| version_compile_os | Win32 |
+-------------------------+------------------------------+

I tried to add a CHECK constraint for the gender. I tried both these and without success. I saw a lot of people report it as a bug, but not sure if it's a but or I do something wrong.

I tried

as well as

when define the table.

Is my syntax wrong? Thank you for your time.

Sorry but both of those look valid to me. But I've seen some posts that say MySQL doesn't support CHECK constraints. See this thread:

http://forums.mysql.com/read.php?136...474#msg-152474

Be sure to read the replies. They say you may be able to use a trigger to perform the job of the CHECK constraint.

In this case you could also build a lookup table and use it as a foreign key to validate the field. That seems like serious overkill but it should work.

__________________
Rod

Rod Stephens, Microsoft MVP

Essential Algorithms: A Practical Approach to Computer Algorithms

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