Question

我的选择查询：

SELECT 
    ResultTag, Overallstatus, ProcessOrder  
FROM 
    Evaluation

UNION 

SELECT 
    '2' AS ResultTag,
    'Approve' AS Overallstatus,
    '6' AS ProcessOrder

预期结果：

----------  ----------     ----------
Result Tag  Overallstatus  ProcessOrder
----------  ----------     ----------
0            Approved        1
1            Reject          2
.                            . 
.                            .
2            Approve         6

我需要结合两个选择查询的结果。我尝试使用UNION但它只导致第一个查询输出。

先谢谢你的帮助..

Answer 1

如果你有一个重复的行，你应该将Union更改为union All，但是如果没有任何重复并且你没有得到第二个查询结果则会出现问题

Answer 2

使用UNION ALL声明：

  SELECT ResultTag,Overallstatus,ProcessOrder  
  FROM Evaluation
  UNION ALL
  SELECT '2' AS ResultTag,'Approve' AS Overallstatus,'6' AS ProcessOrder

Answer 3

结果可能有重复，请使用UNION ALL

    SELECT 
      ResultTag,Overallstatus,ProcessOrder  from Evaluation

        UNION ALL

 SELECT 
     '2' AS ResultTag,
     'Approve' AS Overallstatus,
     '6' AS ProcessOrder

如何组合2个选择查询值？

3 个答案: