From 02b5667ffc95403940c4d8ecf168417015f807ba Mon Sep 17 00:00:00 2001 From: smallkun Date: Tue, 25 Feb 2025 09:12:11 +0800 Subject: [PATCH] Auto commit --- 2207/MySQL练习题/查询练习.md | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/2207/MySQL练习题/查询练习.md b/2207/MySQL练习题/查询练习.md index 6b8fce9..7057fc6 100644 --- a/2207/MySQL练习题/查询练习.md +++ b/2207/MySQL练习题/查询练习.md @@ -274,7 +274,7 @@ FROM teachers t WHERE t.`name` LIKE '李%'; #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 WHERE st.id = sc.student_id AND sc.course_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 SELECT st.* FROM students st, scores sc -WHERE st.id = sc.student_id AND sc.course_id IN( - SELECT - FROM courses - WHERE student_id = '01' +WHERE st.id = sc.student_id AND st.id <> '01' AND sc.course_id IN( + SELECT course_id + FROM scores s + 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