如何获得字段名称该字段有什么价值？

Question

我有一个表sql server如下，从那个表我想得到quesno，字段名称[该字段有什么价值]

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

输出

QuesNo  Result
1      A,C
2      D

有没有可能获得outpu的方法？

Answer 1

应该这样做......

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