sql获取分组后取某字段最大一条记录

获取分组后取某字段最大一条记录 方法一：(效率最高) select * from test as a where typeindex = (select max(b.typeindex) from test as b where a.type = b.type ); 方法二：(效率次之) select a.* from test a, (select type,max(typeindex) typ

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