从sql表中选择语句

Question

这里有一些QuestionID和OptionID，每个选项都带有IsCorrect标志，我没有办法以所需的格式获得结果集（如附图所示），如果有人提出某种建议会有所帮助以最佳方式实现这一目标，在此先感谢，

declare @temp table
(questionID int, optionID int, isCorrect bit, option_text varchar(50))

insert into @temp values
( 1, 1, 1, 'abc'), (1, 2, 1, 'pqr'), (1, 3, 0, 'mno' ),
(2, 1, 1, 'xyz' ), (2, 2, 1, 'def')

Answer 1

我认为它在SQL Server中使用GROUP_CONCAT函数（2012？）： 我的答案是：
SQL Fiddle

SELECT 
questionID AS [QuestionID]
, option_text AS [OptionText]
, CASE WHEN (CHARINDEX(',', option_text) > 0) THEN 'key'
       WHEN (isCorrect = 1) THEN 'partial key'
       ELSE 'wrong key' END AS [Answere]
FROM
(
    SELECT questionID, option_text, isCorrect
    FROM @temp
    UNION ALL
    SELECT 
    questionID
    , LEFT(keys, LEN(keys) - 1)
    , isCorrect
    FROM
    (
        SELECT questionID
        , (SELECT option_text + ','
           FROM @temp
           WHERE questionID = t.questionID AND isCorrect = 1
           FOR XML PATH('')
           ) AS keys
        , isCorrect
        FROM @temp AS t
        GROUP BY questionID, isCorrect
        HAVING isCorrect = 1
    ) AS connected
) AS result
ORDER BY QuestionID, Answere

Answer 2

试试这个：

SELECT T1.questionId  
           ,option_text = SubString (( SELECT ', ' + T2.option_text 

FROM @temp as T2 
WHERE T1.questionId = T2.questionId 
and  isCorrect = 1
FOR XML PATH ( '' ) ), 3, 1000) 
, 'key'as Answer

FROM @temp as T1 

GROUP BY questionId

union all 
select Questionid, Option_text, 'primary_key'
from @temp
order by 1

Create A Comma Delimited List From a Column