SQL UNIQUE Constraint

[DiL]

Hello Friends,
Actually i have a question about UNIQUE KEY Constraint in our SQL .
I want to use more than one value as a UNIQUE KEY .

Can I do this ?

[DiL]

look this table

CREATE TABLE `users` (
 `id` int(10) NOT NULL default '',
 `nick` varchar(20) NOT NULL default '',
 `pass` varchar(50) NOT NULL default '',
 `emailad` varchar(200) NOT NULL default '',
 `sitead` varchar(200) NOT NULL default '',
 PRIMARY KEY (`id`),
 UNIQUE KEY `nick` (`nick`)
);

In this table UNIQUE KRY is nick

and i want to use nick as wel as emailad and sitead as an UNIQUE KEY

Can anybody tell me that is this posibal or not?

[GumSlone]

go to phpMyAdmin,
-> table structure
remove the unique nick,
then select the nick and email row on the left side and click the unique icon at the bottom of the table structure.