SQL Server：将表连接到自身以水平显示数据

我有一个包含学生分数（StudentsID、科目、年份、分数）的表

我想水平显示同一学生、科目但不同年份的分数

我的问题是，不是所有的科目都可以在所有的年份，我的意思是学生可以采取不同的科目，每年。我想在一张桌子上水平地展示它们

例如：

我试过这个问题

SELECT TOP (100) PERCENT 
    dbo.New_Portal_OldMarks.StudentID, dbo.New_Portal_OldMarks.[Student Name], 
    dbo.New_Portal_OldMarks.SubjectName, dbo.New_Portal_OldMarks.AcademicYear, 
    dbo.New_Portal_OldMarks.Class, dbo.New_Portal_OldMarks.Term1, dbo.New_Portal_OldMarks.Term2, 
    dbo.New_Portal_OldMarks.Term3, dbo.New_Portal_OldMarks.Final, 
    New_Portal_OldMarks_1.AcademicYear AS AcademicYear2, 
    New_Portal_OldMarks_1.Class AS Class2, 
    New_Portal_OldMarks_1.Term1 AS [Term1-2], 
    New_Portal_OldMarks_1.Term2 AS [Term2-2], 
    New_Portal_OldMarks_1.Term3 AS [Term3-2], 
    New_Portal_OldMarks_1.Final AS [Final-2]
FROM
    dbo.New_Portal_OldMarks 
FULL OUTER JOIN
    dbo.New_Portal_OldMarks AS New_Portal_OldMarks_1 ON dbo.New_Portal_OldMarks.StudentID = New_Portal_OldMarks_1.StudentID 
                                                     AND dbo.New_Portal_OldMarks.SubjectName = New_Portal_OldMarks_1.SubjectName
WHERE     
    (dbo.New_Portal_OldMarks.StudentID = 1004000)
ORDER BY 
    AcademicYear2

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我尝试了所有的连接查询（ex-join、LEFT-join、RIGHT-join等），但都返回了错误的结果

您可以使用条件聚合：

SELECT om.ID, om.StudentID, om.[Student Name], om.SubjectName,
       MAX(CASE WHEN om.class = 11 THEN academicyear END) as academicyear,
       MAX(CASE WHEN om.class = 11 THEN class END) as class,
       MAX(CASE WHEN om.class = 11 THEN term1 END) as term1,
       MAX(CASE WHEN om.class = 11 THEN term2 END) as term2,
       MAX(CASE WHEN om.class = 11 THEN term3 END) as term3,
       MAX(CASE WHEN om.class = 11 THEN final END) as final,
       MAX(CASE WHEN om.class = 12 THEN academicyear END) as academicyear,
       MAX(CASE WHEN om.class = 12 THEN class END) as class,
       MAX(CASE WHEN om.class = 12 THEN term1 END) as term1,
       MAX(CASE WHEN om.class = 12 THEN term2 END) as term2,
       MAX(CASE WHEN om.class = 12 THEN term3 END) as term3,
       MAX(CASE WHEN om.class = 12 THEN final END) as final              
FROM dbo.New_Portal_OldMarks om
GROUP BY om.ID, om.StudentID, om.[Student Name], om.SubjectName

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您使用的是什么sql？（mysql、mssql…）Microsoft SQL Server您必须创建一个包含动态列的临时表。使用每个years@RyanNghiem谢谢，我会试试的