常用SQL语句收集

筛选选修全部课程的学生

SELECT student.name FROM student WHERE NOT EXISTS
(
SELECT * FROM course WHERE NOT EXISTS
(
SELECT * FROM student_course WHERE student_course.stuid=student.id
AND course.id=student_course.courseid

)
)

筛选至少选秀了学生A选修的所有课程的学生

SELECT * FROM student,
(SELECT DISTINCT stuid FROM student_course sca
WHERE NOT EXISTS
(
SELECT * FROM student_course scb WHERE (scb.stuid=2 AND
NOT EXISTS (SELECT * FROM student_course scc
WHERE scc.stuid=sca.stuid AND scc.courseid=scb.courseid)
)
)) AS temp WHERE temp.stuid=student.id

优化：筛选至少选秀了学生A选修的所有课程的学生

SELECT [name] AS StudentName  FROM student WHERE id in
(SELECT DISTINCT stuid FROM student_course sca
WHERE NOT EXISTS
(
SELECT * FROM student_course scb WHERE (scb.stuid=2 AND
NOT EXISTS (SELECT * FROM student_course scc
WHERE scc.stuid=sca.stuid AND scc.courseid=scb.courseid)
)
))