SQL查询；水平到垂直

Question

我遇到了涉及将水平行转换为垂直行的 SQL 查询 (SQL Server)

下面是我的数据

No      Flag_1    Flag_2    Flag_3
---      ----      -----     -----
A         1         2         3
B         4         1         6

转换后，表格应该是

No     FlagsName    Flag_value
--      ----        ----------
A        Flag_1        1
A        Flag_2        2  
A        Flag_3        3
B        Flag_1        4
B        Flag_2        1
B        Flag_3        6

任何对此的意见都会有帮助吗？

我正在尝试在分区上使用 ROW_NUMBER 。但不知何故它不起作用!!!

谢谢!!!

Answer 1

您可以使用UNION ALL:

select No, 'Flag_1' as FlagName, Flag_1 as Flag_Value
from yourtable
union all
select No, 'Flag_2' as FlagName, Flag_2 as Flag_Value
from yourtable
union all
select No, 'Flag_3' as FlagName, Flag_3 as Flag_Value
from yourtable

或者UNPIVOT:

select no, FlagsName, flag_value
from yourtable
unpivot
(
    flag_value
    for FlagsName in (Flag_1, Flag_2, Flag_3)
) u

参见SQL Fiddle With Demo