Mysql的獲得日期最近的行鍼對每個特定組

Question

我有表（afk_map_data）：

id map_id state_id measures_id value created_date 

問題是>>我想最近CREATED_DATE僅獲取measures_id值的最新行

我已經嘗試了許多解決方案，我試過很多東西，但它是愚蠢的，我發佈此select語句是清楚我的問題

SELECT md.id,md.measures_id,md.value,md.created_date FROM afk_map_data md  
WHERE 
md.map_id = 1 
AND md.state_id = 2 
AND md.measures_id = 4 


the result was : 

id measures_id value created_date 
1   4  777 2016-07-03 
2   4  888 2016-07-03 
3   4  999 2016-07-02 
4   4  555 2016-07-02 

the result that i want is : 

id measures_id value created_date 
1   4  777 2016-07-03 
2   4  888 2016-07-03 

Thanks a lot .. 

Answer 1

使用MAX條件上日期列

Select TT.id,T.measures_id,TT.value,T.d from afk_map_data TT 
     INNER JOIN (
     SELECT measures_id,MAX(created_date)d FROM afk_map_data 
     GROUP BY measures_id)T 
     ON T.d = TT.created_date 
WHERE 
TT.map_id = 1 
AND TT.state_id = 2 
AND TT.measures_id = 4