I'd like to select the maximum row of a group, but I'd like the query to return the other columns from that row. I know how MAX() ca开发者_Python百科n return the greatest integer in the group, but I don't know how to get the other columns for the max result.
In this example, I'd like to have a query that selects the maximum userId
from each group
but returns the userId and Name
Users
groupId | userId | name
----------------------
1 | 1 | mike
1 | 2 | dave
2 | 3 | bill
2 | 4 | steve
I'd like the output of the query to be
groupId | userId | name
-----------------------
1 | 2 | dave
2 | 4 | steve
I know I could do
select groupId, max(userId)
from Users
group by groupId;
and then do a subquery again on users. I'm just looking to see if there is a better way.
If it matters, I'm using MySQL
Try this
select * from users
join (select groupId, max(userId) as maxU from Users group by groupId) xx
on xx.groupId=users.groupId and users.userId=xx.maxU
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