sql某个字段类型获取分组后取某字段最大最新一条记录

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) typeindex from test group by type) b
where a.type = b.type and a.typeindex = b.typeindex order by a.type