Slide 37
Slide 37 text
主キーと容量
⼩さな主キー
37
CREATE TABLE `sbtest1` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`k` int(11) NOT NULL DEFAULT '0',
`c` char(120) NOT NULL DEFAULT '',
`pad` char(60) NOT NULL DEFAULT '',
PRIMARY KEY (`id`),
KEY `k_1` (`k`),
KEY `c_1` (`c`),
KEY `pad_1` (`pad`)
) ENGINE=InnoDB
CREATE TABLE `sbtest2` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`k` int(11) NOT NULL DEFAULT '0',
`c` char(120) NOT NULL DEFAULT '',
`pad` char(60) NOT NULL DEFAULT '',
PRIMARY KEY (`id`,`k`,`c`),
KEY `k_1` (`k`),
KEY `c_1` (`c`),
KEY `pad_1` (`pad`)
) ENGINE=InnoDB
⼤きな主キー