smallkun/class-notes
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smallkun 2025-02-25 09:12:11 +08:00
parent c57e611d42
commit 02b5667ffc
1 changed files with 5 additions and 5 deletions
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2207/MySQL练习题/查询练习.md
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@ -274,7 +274,7 @@ FROM teachers t
WHERE t.`name` LIKE '李%'; WHERE t.`name` LIKE '李%';
#6.查询学过「张三」老师授课的同学的信息 #6.查询学过「张三」老师授课的同学的信息
SELECT st.* SELECT DISTINCT st.*
FROM students st, scores sc FROM students st, scores sc
WHERE st.id = sc.student_id AND sc.course_id = ( WHERE st.id = sc.student_id AND sc.course_id = (
SELECT c.id SELECT c.id
@ -293,10 +293,10 @@ HAVING COUNT(*) < 3;
#8.查询至少有一门课与学号为" 01 "的同学所学相同的同学的信息 #8.查询至少有一门课与学号为" 01 "的同学所学相同的同学的信息
SELECT st.* SELECT st.*
FROM students st, scores sc FROM students st, scores sc
WHERE st.id = sc.student_id AND sc.course_id IN( WHERE st.id = sc.student_id AND st.id <> '01' AND sc.course_id IN(
SELECT SELECT course_id
FROM courses FROM scores s
WHERE student_id = '01' WHERE s.student_id = '01'
); );
#9.查询和" 01 "号的同学学习的课程完全相同的其他同学的信息 #9.查询和" 01 "号的同学学习的课程完全相同的其他同学的信息