Question

如果我没有正确地填写这个问题，我很抱歉，但是我无法从SQL查询中获得所需的结果。

select u.id as userid,
    quiz.name as quiz_name,
    [moodle_test].[dbo].mdl_question_attempts.questionusageid,
    quiz_attempts.sumgrades as attempt_grade,
    mdl_question_attempts.slot as question_number,
    mdl_question_attempts.questionsummary as question, 
    mdl_question_attempts.rightanswer, 
    mdl_question_attempts.responsesummary 
from    [moodle_test].[dbo].mdl_user as u
inner join  [moodle_test].[dbo].mdl_quiz_attempts as quiz_attempts on u.id = quiz_attempts.userid
inner join [moodle_test].[dbo].mdl_quiz as quiz on quiz.id = quiz_attempts.quiz
left join [moodle_test].[dbo].mdl_question_attempts on quiz_attempts.id = [moodle_test].   [dbo].mdl_question_attempts.questionusageid 
where quiz.course = 2a

产生类似

的数据

userid  quiz_name   questionusageid attempt_grade   question_number question    rightanswer responsesummary
180 Module 2 Pre-Test   285 6.00000 1   A properly structured team yields all of the following benefits, EXCEPT:: A leader is clearly identified; A clear plan of care; The patient is involved in the care process; Team members know their roles and responsibilities A clear plan of care    The patient is involved in the care process
180 Module 2 Pre-Test   285 6.00000 2   A Contingency Team includes all of the following characteristics, EXCEPT:: It is formed for emergent or specific events; It is time-limited (e.g., Code Team, Disaster Response Team, Rapid Response Team); It is composed of team members drawn from a variety of Core Teams; It performs day-to-day operational management    It performs day-to-day operational management   It performs day-to-day operational management
180 Module 2 Pre-Test   285 6.00000 3   Team members include anyone who can take action in the process of patient care. Which of the following characteristics do team members share?: Roles and responsibilities that change; Individual goals that take priority over the team's mission; Accountability only to the team leader; A need to remain continually informed for effective team functioning    A need to remain continually informed for effective team functioning    A need to remain continually informed for effective team functioning
180 Module 2 Pre-Test   285 6.00000 4   Examples of effective strategies for involving patients in their care include all of the following, EXCEPT:: Reviewing the hospital bill with the patient at discharge; Conducting handoffs at the patient's bedside; Providing patients with tools for communicating with their care team; Including patients in bedside rounding  Reviewing the hospital bill with the patient at discharge   Reviewing the hospital bill with the patient at discharge

如何加入三个问题，系统答案和正确答案，以便用户的所有问题答案都在一行中？

Answer 1

确定。这里的主要问题是我们无法知道将进行多少次尝试。 SQL没有简单的方法将可变数量的行转换为可变数量的列。因此，所有这些响应都必须连接成某种分隔的字符串并塞进一个字段中。 XPATH查询可以提供一种方法来实现此目的。

下面，CTE baseTable与您在上面提供的查询相同。然后，动态表Main保存基本结果，但是在answerList中有一个尾随分隔符（在这里使用管道＆＃34; |＆＃34; - 但你可以做任何事情）我们需要去除出。所以，这个第一个查询在桌子上＃Main;＆＃39;只有在那里切掉最后一个分隔符

下一个查询＆＃39; outerQuery＆＃39;标识唯一的列，即相同性＆＃39;你不想重复。它会明确地选择这些行，因此您只能获得每个行中的一个结果集。基本上，您的用户/问题信息

＆＃39; innerQuery＆＃39;使用XML PATH将响应与管道分隔符一起压缩，根据我们在外部查询中识别的不同行将它们排成一行。

我希望这是有道理的;这是代码。未经测试。几乎可以保证包含至少一个拼写错误。希望它有所帮助。

WITH baseTable as
(
select u.id as userid,
    quiz.name as quiz_name,
    [moodle_test].[dbo].mdl_question_attempts.questionusageid,
    quiz_attempts.sumgrades as attempt_grade,
    mdl_question_attempts.slot as question_number,
    mdl_question_attempts.questionsummary as question, 
    mdl_question_attempts.rightanswer, 
    mdl_question_attempts.responsesummary 
from    [moodle_test].[dbo].mdl_user as u
inner join  [moodle_test].[dbo].mdl_quiz_attempts as quiz_attempts on u.id = quiz_attempts.userid
inner join [moodle_test].[dbo].mdl_quiz as quiz on quiz.id = quiz_attempts.quiz
left join [moodle_test].[dbo].mdl_question_attempts on quiz_attempts.id = [moodle_test].   [dbo].mdl_question_attempts.questionusageid 
where quiz.course = 2a
)

Select Main.userid, Main.quiz_name, Main.questionusageid, Main.attemmpt_grade, Main.question_number, Main.question, Main.rightanswer,
       Left(Main.answerList,Len(Main.answerList)-1) As answerList
From
    (
        Select distinct userid, quiz_name, questionusageid, attempt_grade, question_number, question, rightanswer,  
            (
                SELECT innerQuery.responsesummary + '|' AS [text()]
                FROM baseTable innerQuery
                WHERE innerQuery.userid = outerQuery.userid 
                      AND innerQuery.questionusageid = outerQuery.questionusageid
                      AND innerQuery.question_number= outerQuery.question_number
                ORDER BY innerQuery.userid, innerQuery.questionusageid, innerQuery.question_number
                FOR XML PATH ('')
            ) answerList
        From baseTable outerQuery
    )[Main]

列的多个实例合并为一行

1 个答案: