Question

我需要这个Mysql查询的帮助

Select id, code, Tbldetail from TblProd

结果是：

id       code            detail        (i Need ADD Model Column Here)
100    432320-1         Keyboard
101    432325-1         Mouse
102    432329-1         Printer

我有另一个具有这种结构的表：

id     code             model 
1     432320-1           rx1
2     432320-1           rx2
3     432320-1           rx3
4     432325-1           rx1
5     432329-1           rx2
6     432329-1           rx1

我需要这样的输出：

id       code            detail               Model
100    432320-1         Keyboard          rx1,rx2,rx3
101    432325-1         Mouse             rx1
102    432329-1         Printer           rx2,rx1

我该怎么做？

Answer 1

这正是你在标题中所说的：

SELECT p.id, p.code, p.detail, GROUP_CONCAT(m.model ORDER BY m.model) as model
FROM TblProd AS p
LEFT JOIN TblModel AS m ON p.code = m.code
GROUP BY p.id

Answer 2

有几种方法可以获得这种结果。

LEFT JOIN的一种替代方法是在SELECT列表中使用相关查询。

 SELECT t.id
      , t.code
      , t.detail
      , ( SELECT GROUP_CONCAT(DISTINCT r.model ORDER BY r.model)
            FROM TblModel r
           WHERE r.code = t.code
        ) AS model  
  FROM TblProd t
 ORDER BY t.id

Answer 3

SELECT a.id, a.code, a.detail, GROUP_CONCAT(b.model) as model
FROM TblProd AS a,TblModel AS b ON a.code = b.code
GROUP BY a.id

Mysql Union Left Join Group Concat

3 个答案: