SQL查询 - 将多列放入一列

Question

我在这里进行了一次狩猎和google并且无法找到任何东西.

我确实来到了CONCAT功能,但因为我公司运行的SQL Server 2008不是一个选项:(

我有一个输出多列/行的查询,我想在一列中显示结果.

例:

SELECT client, owner, payer, status
FROM Main
WHERE status = 'Active'

结果:

client | owner | payer | status

1      |  2    |  3    | Active
10     |  11   | 12    | Active

我希望它看起来像什么

ColumnX  |
1
2
3 
Active
10
11
12
Active

在此先感谢您的帮助,我希望这是有道理的:)

干杯,迈克尔

Answer 1

你所指的是被称为UNPIVOT.这将获取列并将它们转换为行:

SELECT value, field
FROM
(
  select cast(client as varchar(10)) client, 
    cast(owner as varchar(10)) owner, 
    cast(payer as varchar(10)) payer, 
    status
  from main
  where status = 'Active'
) x
unpivot
(
  value 
  for field in (client, owner, payer, status)
) u

请参阅SQL Fiddle with Demo

该UNPIVOT会给你值列表中的一列,然后从其他附带的列.

a所需的UNPIVOT是所有字段都具有相同的数据类型,因此您需要执行数据类型的转换,以便它们可以显示在同一列中.

您也可以使用a UNION ALL来执行此操作,但同样需要cast()数据类型相同:

SELECT cast(client as varchar(10)) value
FROM main
WHERE status = 'active'
UNION ALL
SELECT cast(owner as varchar(10)) value
FROM main
WHERE status = 'active'
UNION All
SELECT cast(payer as varchar(10)) value
FROM main
WHERE status = 'active'
UNION ALL
SELECT status
FROM main
WHERE status = 'active'

请参阅SQL Fiddle with Demo