假如现在有表结构:
CREATE TABLE `msg_detail` (
`id` INT(11) NOT NULL AUTO_INCREMENT COMMENT 'id',
`title` VARCHAR(200) NOT NULL DEFAULT '' COMMENT '标题',
`content` TEXT NOT NULL COMMENT '内容',
`audio_url` VARCHAR(255) NOT NULL DEFAULT '' COMMENT '音频地址',
`type_id` TINYINT(4) NOT NULL DEFAULT '',
PRIMARY KEY (`id`),
INDEX `cid` (`cid`) USING BTREE,
INDEX `column_id` (`column_id`) USING BTREE
)
COMMENT='内参表'
COLLATE='utf8_general_ci'
ENGINE=InnoDB
AUTO_INCREMENT=1;
查询所有类型内参最大id,可用如下sql:
select max(id),type_id from msg_detail group by type_id;