SQL查询;水平垂直

Question

我坚持用SQL查询（SQL Server）的，涉及到转换横排竖行

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，该表应该是

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 

对此的任何输入将有帮助吗？

我试图在分区上玩ROW_NUMBER。但它不工作!!!

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UNPIVOT：

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

见SQL Fiddle With Demo