Mysql按字段分组取最大值记录

Mysql按字段分组取最大值记录 Mysql按字段分组取最大值记录
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要求:获得 按table1_id分组,并且age最大的记录信息,即2、3、5条 方法一: select * from (select * from table2 order by age desc) as a group by a.table1_id 方法二: select a.* from table2 as a where age = (select max(age) from table2 where a.table1_id=table1_id) 方法三: select a.* from table2 as a where not exists (select * from table2 where table1_id=a.table1_id and age>a.age) 方法四: select a.* from table2 as a where exists (select count(*) from table2 where table1_id=a.table1_id and age>a.age having count(*)=0) 参考资源: http://blog.sina.com.cn/s/blog_8155e74d0101g1pl.html 【Mysql按字段分组取最大值记录】转载于:https://www.cnblogs.com/zhangjianqiang/articles/6679093.html

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