如何获取字段名称是什么字段有价值？

Question

我有一个表的SQL Server像下面，从该表中我想quesno，字段名[哪些领域具有价值]

QuesNo A B C D 
1  1 0 1 0 
2  0 0 0 1 

输出：

QuesNo Result 
1  A,C 
2  D 

有任何可能的方式获得输出？

Answer 1

这应该做到这一点...

SELECT QuesNo, SUBSTRING(Answers, 1, LENGTH(Answers) - 1) AS Answers 
FROM (
    SELECT QuesNo, 
      CASE 
      WHEN A <> 0 THEN 'A,' 
      ELSE '' 
      END + 
      CASE 
      WHEN B <> 0 THEN 'B,' 
      ELSE '' 
      END + 
      CASE 
      WHEN C <> 0 THEN 'C,' 
      ELSE '' 
      END + 
      CASE 
      WHEN D <> 0 THEN 'D,' 
      ELSE '' 
      END AS Answers 
FROM yourtable 
) Foo