diff --git "a/37 \351\227\253\351\233\252\350\216\262/20231020 \347\273\203\344\271\240.md" "b/37 \351\227\253\351\233\252\350\216\262/20231020 \347\273\203\344\271\240.md" new file mode 100644 index 0000000000000000000000000000000000000000..0e1759d151d2a1f8d61a713a4bf3a4ba084789c1 --- /dev/null +++ "b/37 \351\227\253\351\233\252\350\216\262/20231020 \347\273\203\344\271\240.md" @@ -0,0 +1,264 @@ +```sql +create DATABASE yyyy charset utf8; +# 学生表 +CREATE TABLE IF NOT EXISTS `student`( + `student_id` INT(10) NOT NULL AUTO_INCREMENT COMMENT '学号', + `student_name` VARCHAR(10) NOT NULL DEFAULT '匿名' COMMENT '姓名', + `birthday` DATETIME NOT NULL COMMENT '出生日期', + `gender` VARCHAR(10) NOT NULL DEFAULT '男' COMMENT '性别', + PRIMARY KEY(`student_id`) +)ENGINE=INNODB CHARSET=utf8; + +INSERT INTO `student` VALUES +(1 , '赵雷' , '1990-01-01' , '男'), +(2 , '钱电' , '1990-12-21' , '男'), +(3 , '孙风' , '1990-12-20' , '男'), +(4 , '李云' , '1990-12-06' , '男'), +(5 , '周梅' , '1991-12-01' , '女'), +(6 , '吴兰' , '1992-01-01' , '女'), +(7 , '郑竹' , '1989-01-01' , '女'), +(8 , '张三' , '2017-12-20' , '女'), +(9 , '李四' , '2017-12-25' , '女'), +(10 , '李四' , '2012-06-06' , '女'), +(11 , '赵六' , '2013-06-13' , '女'), +(12 , '孙七' , '2014-06-01' , '女'); +-- 课程表 +CREATE TABLE IF NOT EXISTS `course`( + `course_id` INT(4) NOT NULL AUTO_INCREMENT COMMENT '课程编号', + `course_name` VARCHAR(10) NOT NULL COMMENT '课程名', + `teacher_id` INT(10) NOT NULL COMMENT '任课教师工号', + PRIMARY KEY(`course_id`) +)ENGINE=INNODB CHARSET=utf8; + +INSERT INTO `course` VALUES +(1, '语文', 2), +(2, '数学', 1), +(3, '英语', 3); +# 教师表 +CREATE TABLE IF NOT EXISTS `teacher`( + `teacher_id` INT(10) NOT NULL AUTO_INCREMENT COMMENT '教师工号', + `teacher_name` VARCHAR(10) NOT NULL DEFAULT '匿名' COMMENT '教师姓名', + PRIMARY KEY(`teacher_id`) +)ENGINE=INNODB CHARSET=utf8; + +INSERT INTO `teacher` VALUES +(1, '高斯'), +(2, '李白'), +(3, 'Trump'); + +-- 成绩表 +CREATE TABLE IF NOT EXISTS `score`( + `student_id` INT(10) NOT NULL COMMENT '学号', + `course_id` INT(4) NOT NULL COMMENT '课程编号', + `score` DECIMAL(18,1) COMMENT '成绩', + KEY(`course_id`) +)ENGINE=INNODB CHARSET=utf8; + +INSERT INTO `score` VALUES +(1 , 1 , 80), +(1 , 2 , 90), +(1 , 3 , 99), +(2 , 1 , 70), +(2 , 2 , 60), +(2 , 3 , 80), +(3 , 1 , 80), +(3 , 2 , 80), +(3 , 3 , 80), +(4 , 1 , 50), +(4 , 2 , 30), +(4 , 3 , 20), +(5 , 1 , 76), +(5 , 2 , 87), +(6 , 1 , 31), +(6 , 3 , 34), +(7 , 2 , 89), +(7 , 3 , 98); + + + + +## 题目： + +-- 1. 查询" 1 "课程比" 2 "课程成绩高的学生的信息（学号、姓名、性别、出生日期）及课程分数 +with aa as (select student.student_id,student_name,gender,birthday,course_id,score from student,score where student.student_id=score.student_id and course_id=1), + bb as (select student.student_id,student_name,gender,birthday,course_id,score from student,score where student.student_id=score.student_id and course_id=2) + select aa.student_id,aa.student_name,aa.gender,aa.birthday,aa.score,bb.score from aa,bb where aa.student_id=bb.student_id and aa.score>bb.score; + + +-- 2. 查询同时参与" 1 "课程和" 2 "课程考试的学生信息 +with aa as (select student.student_id,student_name,gender,birthday,course_id,score from student,score where student.student_id=score.student_id and course_id=1), + bb as (select student.student_id,student_name,gender,birthday,course_id,score from student,score where student.student_id=score.student_id and course_id=2) + select * from aa,bb where aa.student_id=bb.student_id; + + +-- 3. 查询存在" 1 "课程但可能不存在" 2 "课程的情况(不存在时显示为 null ) + +with aa as (select student.student_id,student_name,birthday,course_id,score from student,score where student.student_id=score.student_id and course_id=1), + bb as (select student.student_id,student_name,gender,birthday,course_id,score from student,score where student.student_id=score.student_id and course_id=2) + select * from aa left join bb on aa.student_id=bb.student_id where gender is null; + +-- 4. 查询不存在" 1 "课程但存在" 2 "课程的情况 +with aa as (select student.student_id,student_name,gender,birthday,course_id,score from student,score where student.student_id=score.student_id and course_id=1), + bb as (select student.student_id,student_name,birthday,course_id,score from student,score where student.student_id=score.student_id and course_id=2) + select * from aa right join bb on aa.student_id=bb.student_id where gender is null; + +-- 5. 查询平均成绩大于等于 60 分的同学的学生编号、姓名和平均成绩 +with aa as +(select distinct student_name,avg(score) over (partition by student.student_id) 平均成绩 from student,score where student.student_id=score.student_id) select * from aa where 平均成绩>=60; +-- 6. 查询在成绩表存在成绩的学生信息 + +select * from student left join score on student.student_id=score.student_id where score.score is not null; +-- 7. 查询所有同学的学生编号、学生姓名、选课总数、所有课程的总成绩(没成绩的显示为 null ) +select distinct student.student_id,student.student_name,count(score.course_id) over (partition by student.student_id),sum(score) over (partition by student.student_id) from student left join score on student.student_id=score.student_id; +-- 8. 查询「李」姓老师的数量 +select count(teacher_id) from teacher where teacher_name like '李%'; +-- 9. 查询学过「李白」老师授课的同学的信息 +select * from student,score,course,teacher where student.student_id=score.student_id and score.course_id=course.course_id and course.teacher_id=teacher.teacher_id and teacher.teacher_name='李白' ; +-- 10. 查询没有学全所有课程的同学的信息 +select distinct *,count(score.course_id) over (partition by student.student_id),sum(score) over (partition by student.student_id) from student left join score on student.student_id=score.student_id where score is null ; +-- 11. 查询至少有一门课与学号为" 1 "的同学所学相同的同学的信息 +select * from student,score where student.student_id=score.student_id and course_id in( +select course_id from student,score where student.student_id=score.student_id and student.student_id=1); +-- 12. 查询和" 1 "号的同学学习的课程完全相同的其他同学的信息 + +with aa as +(select distinct student.student_id,student.student_name,sum(score.course_id) over (partition by student.student_id ) 课程编号和 from student,score where student.student_id=score.student_id) +select aa.student_id,aa.student_name from aa where 课程编号和=(select sum(course_id) from student,score where student.student_id=score.student_id and student.student_id=1 and aa.student_id!=1); + +-- 13. 查询没学过「李白」老师讲授的任一门课程的学生姓名 +select distinct student.student_name from student,score,course,teacher where student.student_id=score.student_id and score.course_id=course.course_id and course.teacher_id=teacher.teacher_id and teacher.teacher_name !='李白' ; +-- 14. 查询两门及其以上不及格课程的同学的学号，姓名及其平均成绩 +select distinct student.student_id,count(student.student_id) over (partition by student.student_id) 不及格课程个数,student.student_name,avg(score) over (partition by student.student_id) from student,score where student.student_id=score.student_id and score.score<60; + +-- 15. 检索" 1 "课程分数小于 60，按分数降序排列的学生信息 + +select * from student,score where student.student_id=score.student_id and score.course_id=1 and score<60 order by score desc; + +-- 16. 按平均成绩从高到低显示所有学生的所有课程的成绩以及平均成绩 +with aa as +(SELECT student.student_id,student.student_name,student.birthday,student.gender,score.course_id,score,avg( score ) over (PARTITION BY student.student_id ) 平均成绩 FROM student,score WHERE student.student_id = score.student_id) select * from aa order by 平均成绩 desc; +; +-- 17. 查询各科成绩最高分、最低分和平均分 +select distinct score.course_id,max(score) over (partition by score.course_id) 成绩最高分,min(score) over (partition by score.course_id) 成绩最低分,avg(score) over (partition by score.course_id) 成绩平均分 from student inner join score on student.student_id=score.student_id; +-- 18. 以如下形式显示：课程 ID，课程 name，最高分，最低分，平均分，及格率，中等率，优良率，优秀率（及格为>=60，中等为：70-80，优良为：80-90，优秀为：>=90），要求输出课程号和选修人数，查询结果按人数降序排列，若人数相同，按课程号升序排列 +select distinct score.course_id, +course.course_name, +count(course.course_id) over (partition by score.course_id) 各科人数, +max(score) over (partition by score.course_id) 成绩最高分, +min(score) over (partition by score.course_id) 成绩最低分, +avg(score) over (partition by score.course_id) 成绩平均分, +case when score.score>=90 then 1/count(course.course_id) over (partition by score.course_id) + when score.score>=80 and score.score<90 then 1/count(course.course_id) over (partition by score.course_id) + when score.score>=70 and score.score<80 then 1/count(course.course_id) over (partition by score.course_id) + when score.score>60 then 1/count(course.course_id) over (partition by score.course_id) + end + +from student,score,course where student.student_id=score.student_id and score.course_id=course.course_id; + + +-- 19. 按各科成绩进行排序，并显示排名，Score 重复时保留名次空缺 +SELECT student.student_id,student.student_name,student.birthday,student.gender,score.course_id,score, RANK() over (PARTITION BY score.course_id order by score.score desc) FROM student,score WHERE student.student_id = score.student_id; +-- 20. 按各科成绩进行排序，并显示排名，Score 重复时合并名次 +SELECT student.student_id,student.student_name,student.birthday,student.gender,score.course_id,score, DENSE_RANK() over (PARTITION BY score.course_id order by score.score desc) FROM student,score WHERE student.student_id = score.student_id; + +-- 21. 查询学生的总成绩，并进行排名，总分重复时保留名次空缺 +with aa as +(SELECT distinct student.student_id,student.student_name,student.birthday,student.gender,sum(score) over (PARTITION BY student.student_id) 总成绩 FROM student,score WHERE student.student_id = score.student_id) +select *,RANK() over (order by 总成绩 desc) from aa ; +-- 22. 查询学生的总成绩，并进行排名，总分重复时不保留名次空缺 +with aa as +(SELECT distinct student.student_id,student.student_name,student.birthday,student.gender,sum(score) over (PARTITION BY student.student_id) 总成绩 FROM student,score WHERE student.student_id = score.student_id) +select *,DENSE_RANK() over (order by 总成绩 desc) from aa ; +-- 23. 统计各科成绩各分数段人数：课程编号，课程名称，[100-85]，[85-70]，[70-60]，[60-0] 及所占百分比 + +-- 24. 查询各科成绩前三名的记录 +with aa as +(SELECT student.student_id,student.student_name,student.birthday,student.gender,score.course_id,score, DENSE_RANK() over (PARTITION BY score.course_id order by score.score desc) 排名 FROM student,score WHERE student.student_id = score.student_id) +select * from aa where 排名<=3; +-- 25. 查询每门课程被选修的学生数 +select distinct course.course_id,course_name,count(student.student_id) over (partition by score.course_id) 学生数 from student,score,course where student.student_id=score.student_id and score.course_id=course.course_id; +-- 26. 查询出只选修两门课程的学生学号和姓名 +with aa as +(select student.student_id,student.student_name,count(score.course_id) over (partition by student.student_id) 课程数量 from student left join score on student.student_id=score.student_id) +select distinct * from aa where 课程数量=2; +-- 27. 查询男生、女生人数 +select distinct gender,count(student_id) over (partition by gender) 人数 from student; +-- 28. 查询名字中含有「风」字的学生信息 +select * from student where student_name like '%风%'; +-- 29. 查询同名同性学生名单，并统计同名人数 +with aa as +(select *,count(student_id) over (partition by student_name) 同名人数,count(student_id) over (partition by gender) 同性人数 from student) +select * from aa where 同名人数>=2; + +-- 30. 查询 1990 年出生的学生名单 +select * from student where YEAR(birthday)=1990; + +-- 31. 查询每门课程的平均成绩，结果按平均成绩降序排列，平均成绩相同时，按课程编号升序排列 +with aa as +(select distinct course.course_id,course.course_name,avg(score.score) over (partition by score.course_id order by score.course_id) 平均成绩 from student,score,course where student.student_id=score.student_id and score.course_id=course.course_id) +select *,ROW_NUMBER() over (order by 平均成绩 desc) 排名 from aa ; +-- 32. 查询平均成绩大于等于 85 的所有学生的学号、姓名和平均成绩 +with aa as +(select distinct student.student_id,student.student_name,avg(score) over (partition by student.student_id) 平均成绩 from student,score where student.student_id=score.student_id) +select * from aa where 平均成绩>=85; + +-- 33. 查询课程名称为「数学」，且分数低于 60 的学生姓名和分数 +select student_name,score from student,score,course where student.student_id=score.student_id and score.course_id=course.course_id and course_name='数学' and score.score<60; +-- 34. 查询所有学生的课程及分数情况（存在学生没成绩，没选课的情况） +select student.student_id,student.student_name,score,score.course_id,course_name from student left join score on student.student_id=score.student_id left join course on score.course_id=course.course_id; +-- 35. 查询任何一门课程成绩在 70 分以上的姓名、课程名称和分数 +select student.student_name,course_name,score, ROW_NUMBER() over(partition by student.student_id) from student,score,course where student.student_id=score.student_id and score.course_id=course.course_id and score.score>70; +-- 36. 查询不及格的课程 +select distinct course_name from student,score,course where student.student_id=score.student_id and score.course_id=course.course_id and score<60; +-- 37. 查询课程编号为 1 且课程成绩在 80 分以上的学生的学号和姓名 +select student.student_id,student.student_name from student,score where student.student_id=score.student_id and course_id=1 and score>=80; +-- 38. 求每门课程的学生人数 +select distinct course.course_id,course_name,count(student.student_id) over (partition by course.course_id) from student,score,course where student.student_id=score.student_id and score.course_id=course.course_id; +-- 39. 成绩不重复，查询选修「Trunp」老师所授课程的学生中，成绩最高的学生信息及其成绩 +select * from student,score where student.student_id=score.student_id and score=( +select max(score) from student,score,course,teacher where student.student_id=score.student_id and score.course_id=course.course_id and course.teacher_id=teacher.teacher_id and teacher_name='Trump'); + +-- 40. 成绩有重复的情况下，查询选修「李白」老师所授课程的学生中，成绩最高的学生信息及其成绩 +select * from student,score,course,teacher where student.student_id=score.student_id and score.course_id=course.course_id and course.teacher_id=teacher.teacher_id and score=( +select max(score) from student,score,course,teacher where student.student_id=score.student_id and score.course_id=course.course_id and course.teacher_id=teacher.teacher_id and teacher_name='李白') and teacher_name='李白'; +-- 41. 查询不同课程成绩相同的学生的学生编号、课程编号、学生成绩 +with bb as +(with aa as +(select distinct student.student_id,score.course_id,score,count(student.student_id) over (partition by score ) 课程成绩相同个数 from student,score where student.student_id=score.student_id) +select *,count(student_id) over(partition by student_id) 学生编号个数 from aa where 课程成绩相同个数 >=2) +select bb.student_id,bb.course_id,bb.score from bb where 学生编号个数>=2; + +-- 42. 查询每门功成绩最好的前两名 +with aa as +(SELECT student.student_id,student.student_name,student.birthday,student.gender,score.course_id,score, DENSE_RANK() over (PARTITION BY score.course_id order by score.score desc) 排名 FROM student,score WHERE student.student_id = score.student_id) +select * from aa where 排名<=2; +-- 43. 统计每门课程的学生选修人数（超过 5 人的课程才统计）。 +with aa as +(select distinct course_id,count(student.student_id) over (partition by course_id) 学生选修人数 from student,score where student.student_id=score.student_id) +select * from aa where 学生选修人数>5; +-- 44. 检索至少选修两门课程的学生学号 +with aa as +(select student.student_id,student.student_name,student.birthday,student.gender,count(score.course_id) over (partition by student.student_id) 课程数量 from student left join score on student.student_id=score.student_id) +select distinct aa.student_id from aa where 课程数量>=2; + +-- 45. 查询选修了全部课程的学生信息 +with aa as +(select student.student_id,student.student_name,student.birthday,student.gender,count(score.course_id) over (partition by student.student_id) 课程数量 from student left join score on student.student_id=score.student_id) +select distinct * from aa where 课程数量=3; +-- 46. 查询各学生的年龄，只按年份来算 +select *,datediff(NOW(),birthday)/365 from student; +-- 47. 按照出生日期来算，当前月日 < 出生年月的月日则，年龄减一 + +-- 48. 查询本周过生日的学生 +select week(now(),1) +select *,week(birthday,1) from student where week(birthday,1)=week(NOW(),1); +-- 49. 查询下周过生日的学生 +select week(now(),1) +select *,week(birthday,1) from student where week(birthday,1)=week(NOW(),1)+1; +-- 50. 查询本月过生日的学生 +select *,MONTH(birthday) from student where MONTH(birthday) =MONTH(NOW()); +-- 51. 查询下月过生日的学生 +select *,MONTH(birthday) from student where MONTH(birthday) =MONTH(NOW())+1; + +``` +