Question

我需要帮助。下面是我的表

ID | method  | country | state | zip |   
---+---------+---------+-------+-----+    
 1 | method1 |     C   |   -   |   - |    
 2 | method2 |     C   |   S   |   - |    
 3 | method3 |     C   |   S   |   - |    
 4 | method4 |     C   |   -   |   Z |    
 5 | method5 |     C   |   S   |   Z |   
 6 | method6 |     C   |   -   |   Z |

现在我需要查询，如果我搜索ID（1,2,4）我应该得到这样的查询结果（因为s存在于method2而z存在于method4）

County | State | zip
 C     | S     | Z

如果我搜索id（1,2）我应该得到像那样的查询结果

County | State | zip
 C     | S     | -

如果我搜索id（1,4,6）我应该得到像那样的查询结果

County | State | zip
 C     | -     | Z

请有人帮帮我。我怎么能用mysql查询得到这个。可以肯定的是，每次我必须得到一行结果。

Answer 1

以下内容如何：

SELECT 
(
  SELECT County
  FROM MyTable
  WHERE ID IN (1,2)
  ORDER BY County DESC
  LIMIT 1
) AS County,
(
  SELECT State
  FROM MyTable
  WHERE ID IN (1,2)
  ORDER BY State DESC
  LIMIT 1
) AS State,
(
  SELECT zip
  FROM MyTable
  WHERE ID IN (1,2)
  ORDER BY zip DESC
  LIMIT 1
) AS Zip

如何查询从数据库表中查找公共值

1 个答案: