MySQL 查询某个字段不重复的所有记录

复制代码 代码如下:

select a.* from book a right join (
select max(id) id from book group by title) b on b.id = a.id
where a.id is not null

复制代码 代码如下:

select a.* from book a right join (
select min(id) id from book group by title) b on b.id = a.id
where a.id is not null