Question

如何通过获取最后一条数据记录逐项加入t_detail和t_header mysql？

id | doc | item | price
1  | 002 | asz  | 1200
2  | 002 | aqw  | 3000
3  | 002 | qwe  | 1300
4  | 005 | qwe  | 1000
5  | 005 | aqw  | 2000

输出

id | doc | item | price
1  | 002 | asz  | 1200
4  | 005 | qwe  | 1000
5  | 005 | aqw  | 2000

Answer 1

试试这个，

SELECT * FROM table WHERE id IN (SELECT MAX(id) FROM table GROUP BY item)

Answer 2

试试这个：扩展@Kushan的答案

SELECT * FROM table t1
WHERE id IN (SELECT MAX(id) FROM table t2 
WHERE t2.item = t1.item GROUP BY item )

Answer 3

Use GROUP BY and JOIN :

SELECT id,doc,item,price  
FROM Table1
JOIN
(
  SELECT MAX(Id) _Id,item
  FROM Table1
  GROUP BY item    
) A ON A._Id = id

Answer 4

获得更多表现：

SELECT 
    d.* 
FROM 
   t_detail d INNER JOIN 
            (
               SELECT 
                  MAX(id) as 'id' 
               FROM t_detail 
            GROUP BY item
            ) dmax on d.id = dmax.id ;

这样查询只执行一次。

从mysql获取每个项目的最后输入记录

4 个答案: