要从表中获取具有特定值的列名称

Question

请告诉我如何获取特定行的列值= 123的列名称。提前感谢。

Answer 1

-- Test table 
declare @T table(ID int, Col1 varchar(10), Col2 int, Col3 bit, Col4 varchar(max)) 
insert into @T values (1, '123', 123, 1, 'Some text long text') 

-- ID to get one row 
declare @ID int 
set @ID = 1 

-- Value to search for 
declare @Val varchar(10) 
set @Val = '123' 

select 
    Col.value('local-name(.)', 'varchar(max)') as ColName 
from (select * 
     from @T 
     where ID = @ID 
     for xml path(''), type) as T(XMLCol) 
    cross apply 
    T.XMLCol.nodes('*') as n(Col) 
where Col.value('.', 'varchar(10)') = @Val 

结果

ColName 
-------- 
Col1 
Col2