Question

我希望将两个查询与多个列结合起来，就像在其他帖子中推荐的那样

select NULL AS Col1
       ,NULL AS Col2
       ,NULL AS Col3
       ,Col4
       ,Col5

union 

select Col1
       ,Col2
       ,Col3
       ,NULL AS Col4
       ,NULL AS Col5

我明白了：

Col1 | Col2 | Col3 | Col4 | Col5 
---------------------------------
NULL | NULL | NULL |  2   |  0
 7   |  3   |  4   | NULL | NULL

有没有办法合并行？由于这个别名我不能按列分组。

我想得到

Col1 | Col2 | Col3 | Col4 | Col5 
---------------------------------
  7  |  3   |   4  |  2   |  0

Answer 1

根据DhruvJoshi的回答，你可以尝试这样，

SELECT B.Col1
    ,B.col2
    ,B.col3
    ,A.col4
    ,A.col5
FROM (
    SELECT NULL AS Col1
        ,NULL AS Col2
        ,NULL AS Col3
        ,2 AS Col4
        ,0 AS Col5
    ) A
CROSS JOIN (
    SELECT 7 AS Col1
        ,3 AS Col2
        ,4 AS Col3
        ,NULL AS Col4
        ,NULL AS Col5
    ) B

Answer 2

是的，您可以将CROSS JOIN用于下面的用例

select Col1 ,Col2 ,Col3, Col4 ,Col5 from tblA CROSS JOIN tblB

See working SQL demo

Answer 3

试试这个：

SELECT SUM(Col1) AS 'Col1',  SUM(Col2) AS 'Col2', SUM(Col3) AS 'Col3', SUM(Col4) AS 'Col4', SUM(Col5) AS 'Col5' FROM
(
select NULL AS Col1
       ,NULL AS Col2
       ,NULL AS Col3
       ,Col4
       ,Col5

union 

select Col1
       ,Col2
       ,Col3
       ,NULL AS Col4
       ,NULL AS Col5
) A

SQL Server：具有多个列的联合

3 个答案: