Does UNIQ constraint mean also an index on that field(s)?
- by Gremo
As title, should i defined a separate index on email column (for searching purposes) or the index is "automatically" added along with UNIQ_EMAIL_USER constraint?
CREATE TABLE IF NOT EXISTS `customer` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`user_id` int(11) NOT NULL,
`first` varchar(255) NOT NULL,
`last` varchar(255) NOT NULL,
`slug` varchar(255) NOT NULL,
`email` varchar(255) NOT NULL,
`created_at` datetime NOT NULL,
`updated_at` datetime NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `UNIQ_SLUG` (`slug`),
UNIQUE KEY `UNIQ_EMAIL_USER` (`email`,`user_id`),
KEY `IDX_USER` (`user_id`)
) ENGINE=InnoDB;
