mysql分組查詢擷取組內某欄位最大的記錄

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標籤:

id  sid  cid 
1   1    1
2   1    2
3   2    1

以sid分組,最後取cid最大的那一條,以上要取第2、3條

1 方法一: 2 select * from (select * from table order by cid desc) as a group by a.sid 3 4 方法二: 5 select a.* from table as a where cid = (select max(cid) from table where a.sid = sid) 6 7 方法三: 8 select a.* from table as a where not exists (select * from table where sid=a.sid and cid>a.cid) 9 10 方法四:11 select a.* from table as a where exists (select count(*) from table where sid=a.sid and cid > a.cid having count(*)=0)

 

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mysql分組查詢擷取組內某欄位最大的記錄

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