diff --git "a/13mysql\350\260\203\344\274\230/mysql\347\273\203\344\271\240\351\242\230.md" "b/13mysql\350\260\203\344\274\230/mysql\347\273\203\344\271\240\351\242\230.md"
index 8370fc08..cd873ed7 100644
--- "a/13mysql\350\260\203\344\274\230/mysql\347\273\203\344\271\240\351\242\230.md"
+++ "b/13mysql\350\260\203\344\274\230/mysql\347\273\203\344\271\240\351\242\230.md"
@@ -152,10 +152,11 @@ select * from student where s_id in(
     select distinct a.s_id from score a where a.c_id in(select a.c_id from score a where a.s_id='01')
     );
 -- 13、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  
-select a.* from student a where a.s_id in(
-    select distinct s_id from score where s_id!='01' and c_id in(select c_id from score where s_id='01')
-    group by s_id 
-    having count(1)=(select count(1) from score where s_id='01'));
+SELECT * FROM student WHERE s_id IN 
+(SELECT s_id FROM score WHERE s_id NOT IN
+    (SELECT s_id FROM score WHERE c_id NOT IN (SELECT c_id FROM score WHERE s_id='01'))
+    GROUP BY s_id 
+    HAVING COUNT(*)=(SELECT COUNT(*) FROM score WHERE s_id='01') AND s_id != '01');
 -- 14、查询没学过"张三"老师讲授的任一门课程的学生姓名 
 select a.s_name from student a where a.s_id not in (
     select s_id from score where c_id =