檢查任何列包含字符從一個字符串

Question

我有在包含這樣

class1 class2 class3 class4 
A  D  0  0 
0  A  B  0 
B  0  0  C 
A  0  D  0 

值的表列，我有一個字符串像First="A,B"，Second="C,D"

如何檢查任何一個從字符串包含在這些四列的性格

Answer 1

select * from yourtable where class1 in('A,B,C,D') 
UNION 
select * from yourtable where class2 in('A,B,C,D') 
UNION 
select * from yourtable where class3 in('A,B,C,D') 
UNION 
select * from yourtable where class4 in('A,B,C,D') 

Answer 2

select * from t 
where 

'A,B' like '%'+class1+'%' 
or 
'A,B' like '%'+class2+'%' 
or 
'A,B' like '%'+class3+'%' 
or 
'A,B' like '%'+class4+'%'