联接两个表成为一个记录

Question

我有两个这样的桌子 我想将这两个表加入这个

Student ID SubjectID UTS UAS
1          1         80  80
1          2         88  88

感谢您的帮助。

Answer 1

只需使用内部联接

SELECT A.*, B.UAS
FROM tbl1 AS A JOIN tbl2 AS B ON A.StudentID = B.StudentID AND A.SubjectID = B.SubjectID

Answer 2

SELECT t1.*, t2.UAS
    FROM uts AS t1 
    LEFT JOIN uas AS t2
        ON t1.StudentID = t2.StudentID AND t1.SubjectID = t2.SubjectID

您只需要在两个公共列上连接两个表。

Answer 3

JOIN子句用于根据两个或多个表之间的相关列来组合它们。

   select t1.*,t2.UAS from table1 t1 
     inner join table2 t2 
     ON t1.StudentID = t2.StudentID AND
     t1.SubjectID = t2.SubjectID

有关加入的详细信息，您可以阅读一些教程https://www.w3schools.com/sql/sql_join.asp