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苏州哪家网站建设,vue Wordpress,黄冈论坛黄冈论坛,山东阳信建设局网站–1.学生表 Student(SId,Sname,Sage,Ssex) –SId 学生编号,Sname 学生姓名,Sage 出生年月,Ssex 学生性别 –2.课程表 Course(CId,Cname,TId) –CId 课程编号,Cname 课程名称,TId 教师编号 –3.教师表 Teacher(TId,Tname) –TId 教师编号,Tname 教师姓名 –4.成绩表 SC(SId…–1.学生表 Student(SId,Sname,Sage,Ssex) –SId 学生编号,Sname 学生姓名,Sage 出生年月,Ssex 学生性别 –2.课程表 Course(CId,Cname,TId) –CId 课程编号,Cname 课程名称,TId 教师编号 –3.教师表 Teacher(TId,Tname) –TId 教师编号,Tname 教师姓名 –4.成绩表 SC(SId,CId,score) –SId 学生编号,CId 课程编号,score 分数学生表 Student create table Student(SId varchar(10),Sname varchar(10),Sage datetime,Ssex varchar(10)); insert into Student values(01 , 赵雷 , 1990-01-01 , 男); insert into Student values(02 , 钱电 , 1990-12-21 , 男); insert into Student values(03 , 孙风 , 1990-12-20 , 男); insert into Student values(04 , 李云 , 1990-12-06 , 男); insert into Student values(05 , 周梅 , 1991-12-01 , 女); insert into Student values(06 , 吴兰 , 1992-01-01 , 女); insert into Student values(07 , 郑竹 , 1989-01-01 , 女); insert into Student values(09 , 张三 , 2017-12-20 , 女); insert into Student values(10 , 李四 , 2017-12-25 , 女); insert into Student values(11 , 李四 , 2012-06-06 , 女); insert into Student values(12 , 赵六 , 2013-06-13 , 女); insert into Student values(13 , 孙七 , 2014-06-01 , 女); 科目表 Course create table Course(CId varchar(10),Cname nvarchar(10),TId varchar(10)); insert into Course values(01 , 语文 , 02); insert into Course values(02 , 数学 , 01); insert into Course values(03 , 英语 , 03); 教师表 Teacher create table Teacher(TId varchar(10),Tname varchar(10)); insert into Teacher values(01 , 张三); insert into Teacher values(02 , 李四); insert into Teacher values(03 , 王五); 成绩表 SC create table SC(SId varchar(10),CId varchar(10),score decimal(18,1)); insert into SC values(01 , 01 , 80); insert into SC values(01 , 02 , 90); insert into SC values(01 , 03 , 99); insert into SC values(02 , 01 , 70); insert into SC values(02 , 02 , 60); insert into SC values(02 , 03 , 80); insert into SC values(03 , 01 , 80); insert into SC values(03 , 02 , 80); insert into SC values(03 , 03 , 80); insert into SC values(04 , 01 , 50); insert into SC values(04 , 02 , 30); insert into SC values(04 , 03 , 20); insert into SC values(05 , 01 , 76); insert into SC values(05 , 02 , 87); insert into SC values(06 , 01 , 31); insert into SC values(06 , 03 , 34); insert into SC values(07 , 02 , 89); insert into SC values(07 , 03 , 98); 练习题目 1.查询 01 课程比 02 课程成绩高的学生的信息及课程分数 1.select * from Student RIGHT JOIN ( select t1.SId, class1, class2 from (select SId, score as class1 from sc where sc.CId 01)as t1, (select SId, score as class2 from sc where sc.CId 02)as t2 where t1.SId t2.SId AND t1.class1 t2.class2 ) r on Student.SId r.SId; 2.select * from ( select t1.SId, class1, class2 from (SELECT SId, score as class1 FROM sc WHERE sc.CId 01) AS t1, (SELECT SId, score as class2 FROM sc WHERE sc.CId 02) AS t2 where t1.SId t2.SId and t1.class1 t2.class2 ) r LEFT JOIN Student ON Student.SId r.SId; 2.查询同时存在 01 课程和 02 课程的情况 select * from (select * from sc where sc.CId 01) as t1, (select * from sc where sc.CId 02) as t2 where t1.SId t2.SId; 3.查询存在 01 课程但可能不存在 02 课程的情况(不存在时显示为 null ) select * from (select * from sc where sc.CId 01) as t1 left join (select * from sc where sc.CId 02) as t2 on t1.SId t2.SId; select * from (select * from sc where sc.CId 02) as t2 right join (select * from sc where sc.CId 01) as t1 on t1.SId t2.SId; 4.查询不存在 01 课程但存在 02 课程的情况 select * from sc where sc.SId not in ( select SId from sc where sc.CId 01 ) AND sc.CId 02; 5.查询平均成绩大于等于 60 分的同学的学生编号和学生姓名和平均成绩 1.select student.SId,sname,ss from student,( select SId, AVG(score) as ss from sc GROUP BY SId HAVING AVG(score) 60 )r where student.sid r.sid; 2.select Student.SId, Student.Sname, r.ss from Student right join( select SId, AVG(score) AS ss from sc GROUP BY SId HAVING AVG(score) 60 )r on Student.SId r.SId; 3.select s.SId,ss,Sname from( select SId, AVG(score) as ss from sc GROUP BY SId HAVING AVG(score) 60 )r left join (select Student.SId, Student.Sname from Student)s on s.SId r.SId; 6.查询在 SC 表存在成绩的学生信息 select DISTINCT student.* from student,sc where student.SIdsc.SId 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 ) 1.select student.sid, student.sname,r.coursenumber,r.scoresum from student, (select sc.sid, sum(sc.score) as scoresum, count(sc.cid) as coursenumber from sc group by sc.sid)r where student.sid r.sid; 2.select s.sid, s.sname,r.coursenumber,r.scoresum from ( (select student.sid,student.sname from student )s left join (select sc.sid, sum(sc.score) as scoresum, count(sc.cid) as coursenumber from sc group by sc.sid )r on s.sid r.sid ); 8.查有成绩的学生信息 select * from student where exists (select sc.sid from sc where student.sid sc.sid); select * from student where student.sid in (select sc.sid from sc); 9.查询「李」姓老师的数量 select count() from teacher where tname like 李%; 10.询学过「张三」老师授课的同学的信息 select student. from student,teacher,course,sc where student.sid sc.sid and course.cidsc.cid and course.tid teacher.tid and tname 张三; 11.查询没有学全所有课程的同学的信息 select * from student where student.sid not in ( select sc.sid from sc group by sc.sid having count(sc.cid) (select count(cid) from course) ); 12.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 select * from student where student.sid in ( select sc.sid from sc where sc.cid in( select sc.cid from sc where sc.sid 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 14.查询没学过张三老师讲授的任一门课程的学生姓名 1.select * from student where student.sid not in( select sc.sid from sc where sc.cid in( select course.cid from course where course.tid in( select teacher.tid from teacher where tname 张三 ) ) ); 2.select * from student where student.sid not in( select sc.sid from sc,course,teacher where sc.cid course.cid and course.tid teacher.tid and teacher.tname 张三 ); 15.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 student.SId, student.Sname,b.avg from student RIGHT JOIN (select sid, AVG(score) as avg from sc where sid in ( select sid from sc where score60 GROUP BY sid HAVING count(score)1) GROUP BY sid) b on student.sidb.sid; 16.检索 01 课程分数小于 60按分数降序排列的学生信息 select student.*, sc.score from student, sc where student.sid sc.sid and sc.score 60 and cid 01 ORDER BY sc.score DESC; 17.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 select from sc left join ( select sid,avg(score) as avscore from sc group by sid )r on sc.sid r.sid order by avscore desc; 18.查询各科成绩最高分、最低分和平均分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 sc.CId , max(sc.score)as 最高分, min(sc.score)as 最低分, AVG(sc.score)as 平均分, count()as 选修人数, sum(case when sc.score60 then 1 else 0 end )/count()as 及格率, sum(case when sc.score70 and sc.score80 then 1 else 0 end )/count()as 中等率, sum(case when sc.score80 and sc.score90 then 1 else 0 end )/count()as 优良率, sum(case when sc.score90 then 1 else 0 end )/count()as 优秀率 from sc GROUP BY sc.CId ORDER BY count(*)DESC, sc.CId ASC 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 a.cid, a.sid, a.score, count(b.score)1 as rank from sc as a left join sc as b on a.scoreb.score and a.cid b.cid group by a.cid, a.sid,a.score order by a.cid, rank ASC; 20.按各科成绩进行排序并显示排名 Score 重复时合并名 select a.cid, a.sid, a.score, count(b.score)1 as rank from sc as a left join sc as b on a.scoreb.score and a.cid b.cid group by a.cid, a.sid,a.score order by a.cid, rank ASC; 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 set crank0; select q.sid, total, crank : crank 1 as rank from( select sc.sid, sum(sc.score) as total from sc group by sc.sid order by total desc)q; 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 set crank0; select q.sid, total, crank : crank 1 as rank from( select sc.sid, sum(sc.score) as total from sc group by sc.sid order by total desc)q; 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 select course.cname, course.cid, sum(case when sc.score100 and sc.score85 then 1 else 0 end) as [100-85], sum(case when sc.score85 and sc.score70 then 1 else 0 end) as [85-70], sum(case when sc.score70 and sc.score60 then 1 else 0 end) as [70-60], sum(case when sc.score60 and sc.score0 then 1 else 0 end) as [60-0] from sc left join course on sc.cid course.cid group by sc.cid; 24.查询各科成绩前三名的记录 1.select * from sc where ( select count(*) from sc as a where sc.cid a.cid and sc.scorea.score ) 3 order by cid asc, sc.score desc; 2.select * from sc a left join sc b on a.cid b.cid and a.scoreb.score order by a.cid,a.score; 25.查询每门课程被选修的学生数 select cid, count(sid) from sc group by cid; 26.查询出只选修两门课程的学生学号和姓名嵌套查询 select student.sid, student.sname from student where student.sid in (select sc.sid from sc group by sc.sid having count(sc.cid)2 ); 联合查询 select student.SId,student.Sname from sc,student where student.SIdsc.SId GROUP BY sc.SId HAVING count()2 27.查询男生、女生人数 select ssex, count() from student group by ssex; 28.查询名字中含有「风」字的学生信息 select * from student where student.Sname like %风% 29.查询同名同性学生名单并统计同名人数 select sname, count() from student group by sname having count()1; 30.查询 1990 年出生的学生名单 select * from student where YEAR(student.Sage)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 select sc.cid, course.cname, AVG(SC.SCORE) as average from sc, course where sc.cid course.cid group by sc.cid order by average desc,cid asc; 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 select student.sid, student.sname, AVG(sc.score) as aver from student, sc where student.sid sc.sid group by sc.sid having aver 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.sname, sc.score from student, sc, course where student.sid sc.sid and course.cid sc.cid and course.cname 数学 and sc.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.sname, cid, score from student left join sc on student.sid sc.sid; 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.sname, course.cname,sc.score from student,course,sc where sc.score70 and student.sid sc.sid and sc.cid course.cid; 36.查询不及格的课程 select cid from sc where score 60 group by cid; select DISTINCT sc.CId from sc where sc.score 60; 37.查询课程编号为 01 且课程成绩在 80 分以上的学生的学号和姓名 select student.sid,student.sname from student,sc where cid01 and score80 and student.sid sc.sid; 38.求每门课程的学生人数 select sc.CId,count() as 学生人数 from sc GROUP BY sc.CId; 39.成绩不重复查询选修「张三」老师所授课程的学生中成绩最高的学生信息及其成绩 select student., sc.score, sc.cid from student, teacher, course,sc where teacher.tid course.tid and sc.sid student.sid and sc.cid course.cid and teacher.tname 张三 having max(sc.score); select student., sc.score, sc.cid from student, teacher, course,sc where teacher.tid course.tid and sc.sid student.sid and sc.cid course.cid and teacher.tname 张三 order by score desc limit 1; 40.成绩有重复的情况下查询选修「张三」老师所授课程的学生中成绩最高的学生信息及其成绩 select student., sc.score, sc.cid from student, teacher, course,sc where teacher.tid course.tid and sc.sid student.sid and sc.cid course.cid and teacher.tname 张三 and sc.score ( select Max(sc.score) from sc,student, teacher, course where teacher.tid course.tid and sc.sid student.sid and sc.cid course.cid and teacher.tname 张三 ); 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 select a.cid, a.sid, a.score from sc as a inner join sc as b on a.sid b.sid and a.cid ! b.cid and a.score b.score group by cid, sid; 42.查询每门功成绩最好的前两名 select a.sid,a.cid,a.score from sc as a left join sc as b on a.cid b.cid and a.scoreb.score group by a.cid, a.sid having count(b.cid)2 order by a.cid; 43.统计每门课程的学生选修人数超过 5 人的课程才统计。 select sc.cid, count(sid) as cc from sc group by cid having cc 5; 44.检索至少选修两门课程的学生学号 select sid, count(cid) as cc from sc group by sid having cc2; 45.查询选修了全部课程的学生信息 select student.* from sc ,student where sc.SIdstudent.SId GROUP BY sc.SId HAVING count() (select DISTINCT count() from course ) 46.查询各学生的年龄只按年份来算 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 select student.SId as 学生编号,student.Sname as 学生姓名, TIMESTAMPDIFF(YEAR,student.Sage,CURDATE()) as 学生年龄 from student 48.查询本周过生日的学生 select * from student where WEEKOFYEAR(student.Sage)WEEKOFYEAR(CURDATE()); 49.查询下周过生日的学生 select * from student where WEEKOFYEAR(student.Sage)WEEKOFYEAR(CURDATE())1; 50.查询本月过生日的学生 select * from student where MONTH(student.Sage)MONTH(CURDATE()); 51.查询下月过生日的学生 select * from student where MONTH(student.Sage)MONTH(CURDATE())1;