[英]In SQL, How to display a student who is taking more than one subjects?
例如 - 表名= TABLE
StudentID | SubCode | SubName
-----------------------------
1 M1 Math
1 S1 Science
1 E1 English
2 H1 History
3 G2 Geography
4 M1 Math
我们可以这样显示答案吗?
studentid | SubCode | SubName
---------------------------------
1 M1 Math
1 S1 Science
1 E1 English
带有HAVING
子句的IN()
子查询应该这样做:
SELECT *
FROM table
WHERE StudentID IN (
SELECT
StudentID
FROM table
GROUP BY userid
HAVING COUNT(*) > 1
)
SELECT DISTINCT T1.*
FROM YourTable AS T1
INNER JOIN YourTable AS T2
ON T1.StudentID = T2.StudentID
AND T1.SubCode <> T2.SubCode;
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