SQL Server - Combine two select queries in sql ?
You could also do it in a single query using a join if UNION doesn't count for "single query":
SELECT s2.*
FROM Semester2 s2
LEFT OUTER JOIN Semester1 s1
ON s2.StudentId = s1.StudentId
AND s2.SubjectId = s1.SubjectId
WHERE s1.StudentId IS NULL; The WHERE clause will make it so only results where there isn't a perfect match in Semester1 appear.
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