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Create TABLE dbo.Enrollments (StudentId INT NOT NULL, CourseId INT NOT NULL) insert into dbo.Enrollments values (1,1) insert into dbo.Enrollments values (1,2) insert into dbo.Enrollments values (1,3) insert into dbo.Enrollments values (1,4) insert into dbo.Enrollments values (1,5) insert into dbo.Enrollments values (1,6)
6 rows affected
DECLARE @TempCourses TABLE (CourseId INT); INSERT INTO @TempCourses (CourseId) VALUES (1), (2), (3),(4),(5); SELECT t.StudentId FROM ( SELECT StudentId, cnt=COUNT(*) FROM dbo.Enrollments GROUP BY StudentId ) kc INNER JOIN ( SELECT cnt=COUNT(*) FROM @TempCourses ) nc ON nc.cnt = kc.cnt JOIN dbo.Enrollments t ON t.StudentId = kc.StudentId JOIN @TempCourses n ON n.CourseId = t.CourseId GROUP BY t.StudentId HAVING COUNT(*) = MIN(nc.cnt); drop table dbo.Enrollments
StudentId