Question

我们的结果集有一行，有四列：

value1, value2, value3, value4

我们如何将其转换为包含一行的四行结果集：

value1
value2
value3
value4

Answer 1

如果列已知：

SELECT Value FROM(
    SELECT Value = value1
    FROM dbo.TableName
    UNON ALL
    SELECT Value = value2
    FROM dbo.TableName
    UNON ALL
    SELECT Value = value3
    FROM dbo.TableName
    UNON ALL
    SELECT Value = value4
    FROM dbo.TableName
) X
ORDER BY VALUE -- in case you want that

Answer 2

UNPIVOT数据的另一种方法是使用CROSS APPLY：

select value
from (Your select statement) as x
cross apply
( 
  select 'value1', value1 union all
  select 'value2', value2 union all
  select 'value3', value3 union all
  select 'value4', value4
) c (ColumnName, value);

请参阅Demo

用于将列转换为行的SELECT语句

2 个答案: