好贷网好贷款

50条常用语句(以学生表为例)

发布时间:2016-12-5 10:29:40 编辑:www.fx114.net 分享查询网我要评论
本篇文章主要介绍了"50条常用语句(以学生表为例)",主要涉及到50条常用语句(以学生表为例)方面的内容,对于50条常用语句(以学生表为例)感兴趣的同学可以参考一下。

Student(S#,Sname,Sage,Ssex) 学生表Course(C#,Cname,T#) 课程表SC(S#,C#,score) 成绩表Teacher(T#,Tname) 教师表问题:1、查询“”课程比“”课程成绩高的所有学生的学号;  SELECT a.S# FROM (SELECT s#,score FROM SC WHERE C#='001') a,  (SELECT s#,score  FROM SC WHERE C#='002') b   WHERE a.score>b.score AND a.s#=b.s#; 2、查询平均成绩大于分的同学的学号和平均成绩;    SELECT S#,avg(score)     FROM sc     GROUP BY S# having avg(score) >60; 3、查询所有同学的学号、姓名、选课数、总成绩;  SELECT Student.S#,Student.Sname,count(SC.C#),sum(score)   FROM Student left Outer JOIN SC on Student.S#=SC.S#   GROUP BY Student.S#,Sname 4、查询姓“李”的老师的个数;  SELECT count(distinct(Tname))   FROM Teacher   WHERE Tname like '李%'; 5、查询没学过“叶平”老师课的同学的学号、姓名;    SELECT Student.S#,Student.Sname     FROM Student      WHERE S# not in (SELECT distinct( SC.S#) FROM SC,Course,Teacher WHERE  SC.C#=Course.C# AND Teacher.T#=Course.T# AND Teacher.Tname='叶平'); 6、查询学过“”并且也学过编号“”课程的同学的学号、姓名;  SELECT Student.S#,Student.Sname FROM Student,SC WHERE Student.S#=SC.S# AND SC.C#='001'and exists( SELECT * FROM SC as SC_2 WHERE SC_2.S#=SC.S# AND SC_2.C#='002'); 7、查询学过“叶平”老师所教的所有课的同学的学号、姓名;  SELECT S#,Sname   FROM Student   WHERE S# in (SELECT S# FROM SC ,Course ,Teacher WHERE SC.C#=Course.C# AND Teacher.T#=Course.T# AND Teacher.Tname='叶平' GROUP BY S# having count(SC.C#)=(SELECT count(C#) FROM Course,Teacher  WHERE Teacher.T#=Course.T# AND Tname='叶平')); 8、查询课程编号“”的成绩比课程编号“”课程低的所有同学的学号、姓名;  SELECT S#,Sname FROM (SELECT Student.S#,Student.Sname,score ,(SELECT score FROM SC SC_2 WHERE SC_2.S#=Student.S# AND SC_2.C#='002') score2   FROM Student,SC WHERE Student.S#=SC.S# AND C#='001') S_2 WHERE score2 <score; 9、查询所有课程成绩小于分的同学的学号、姓名;  SELECT S#,Sname   FROM Student   WHERE S# not in (SELECT Student.S# FROM Student,SC WHERE S.S#=SC.S# AND score>60); 10、查询没有学全所有课的同学的学号、姓名;    SELECT Student.S#,Student.Sname     FROM Student,SC     WHERE Student.S#=SC.S# GROUP BY  Student.S#,Student.Sname having count(C#) <(SELECT count(C#) FROM Course); 11、查询至少有一门课与学号为“”的同学所学相同的同学的学号和姓名;    SELECT S#,Sname FROM Student,SC WHERE Student.S#=SC.S# AND C# in SELECT C# FROM SC WHERE S#='1001'; 12、查询至少学过学号为“”同学所有一门课的其他同学学号和姓名;    SELECT distinct SC.S#,Sname     FROM Student,SC     WHERE Student.S#=SC.S# AND C# in (SELECT C# FROM SC WHERE S#='001'); 13、把“SC”表中“叶平”老师教的课的成绩都更改为此课程的平均成绩;    update SC set score=(SELECT avg(SC_2.score)     FROM SC SC_2     WHERE SC_2.C#=SC.C# ) FROM Course,Teacher WHERE Course.C#=SC.C# AND Course.T#=Teacher.T# AND Teacher.Tname='叶平'); 14、查询和“”号的同学学习的课程完全相同的其他同学学号和姓名;    SELECT S# FROM SC WHERE C# in (SELECT C# FROM SC WHERE S#='1002')     GROUP BY S# having count(*)=(SELECT count(*) FROM SC WHERE S#='1002'); 15、删除学习“叶平”老师课的SC表记录;    Delect SC     FROM course ,Teacher      WHERE Course.C#=SC.C# AND Course.T#= Teacher.T# AND Tname='叶平'; 16、向SC表中插入一些记录,这些记录要求符合以下条件:没有上过编号“”课程的同学学号、、    号课的平均成绩;    Insert SC SELECT S#,'002',(SELECT avg(score)     FROM SC WHERE C#='002') FROM Student WHERE S# not in (SELECT S# FROM SC WHERE C#='002'); 17、按平均成绩从高到低显示所有学生的“数据库”、“企业管理”、“英语”三门的课程成绩,按如下形式显示:学生ID,,数据库,企业管理,英语,有效课程数,有效平均分    SELECT S# as 学生ID         ,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='004') AS 数据库        ,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='001') AS 企业管理        ,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='006') AS 英语        ,COUNT(*) AS 有效课程数, AVG(t.score) AS 平均成绩    FROM SC AS t     GROUP BY S#     ORDER BY avg(t.score)  18、查询各科成绩最高和最低的分:以如下形式显示:课程ID,最高分,最低分    SELECT L.C# As 课程ID,L.score AS 最高分,R.score AS 最低分    FROM SC L ,SC AS R     WHERE L.C# = R.C# AND         L.score = (SELECT MAX(IL.score)                       FROM SC AS IL,Student AS IM                       WHERE L.C# = IL.C# AND IM.S#=IL.S#                       GROUP BY IL.C#)         AND         R.Score = (SELECT MIN(IR.score)                       FROM SC AS IR                       WHERE R.C# = IR.C#                   GROUP BY IR.C#                     ); 19、按各科平均成绩从低到高和及格率的百分数从高到低顺序    SELECT t.C# AS 课程号,max(course.Cname)AS 课程名,isnull(AVG(score),0) AS 平均成绩        ,100 * SUM(CASE WHEN  isnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(*) AS 及格百分数    FROM SC T,Course     WHERE t.C#=course.C#     GROUP BY t.C#     ORDER BY 100 * SUM(CASE WHEN  isnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(*) DESC 20、查询如下课程平均成绩和及格率的百分数(用"1行"显示): 企业管理(),马克思(),OO&UML (),数据库()    SELECT SUM(CASE WHEN C# ='001' THEN score ELSE 0 END)/SUM(CASE C# WHEN '001' THEN 1 ELSE 0 END) AS 企业管理平均分        ,100 * SUM(CASE WHEN C# = '001' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '001' THEN 1 ELSE 0 END) AS 企业管理及格百分数        ,SUM(CASE WHEN C# = '002' THEN score ELSE 0 END)/SUM(CASE C# WHEN '002' THEN 1 ELSE 0 END) AS 马克思平均分        ,100 * SUM(CASE WHEN C# = '002' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '002' THEN 1 ELSE 0 END) AS 马克思及格百分数        ,SUM(CASE WHEN C# = '003' THEN score ELSE 0 END)/SUM(CASE C# WHEN '003' THEN 1 ELSE 0 END) AS UML平均分        ,100 * SUM(CASE WHEN C# = '003' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '003' THEN 1 ELSE 0 END) AS UML及格百分数        ,SUM(CASE WHEN C# = '004' THEN score ELSE 0 END)/SUM(CASE C# WHEN '004' THEN 1 ELSE 0 END) AS 数据库平均分        ,100 * SUM(CASE WHEN C# = '004' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '004' THEN 1 ELSE 0 END) AS 数据库及格百分数  FROM SC 21、查询不同老师所教不同课程平均分从高到低显示  SELECT max(Z.T#) AS 教师ID,MAX(Z.Tname) AS 教师姓名,C.C# AS 课程ID,MAX(C.Cname) AS 课程名称,AVG(Score) AS 平均成绩    FROM SC AS T,Course AS C ,Teacher AS Z     WHERE T.C#=C.C# AND C.T#=Z.T#   GROUP BY C.C#   ORDER BY AVG(Score) DESC 22、查询如下课程成绩第3 名到第6 名的学生成绩单:企业管理(),马克思(),UML (),数据库()    [学生ID],[学生姓名],企业管理,马克思,UML,数据库,平均成绩    SELECT  DISTINCT top 3       SC.S# As 学生学号,         Student.Sname AS 学生姓名,       T1.score AS 企业管理,       T2.score AS 马克思,       T3.score AS UML,       T4.score AS 数据库,       ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0) as 总分      FROM Student,SC  LEFT JOIN SC AS T1                       ON SC.S# = T1.S# AND T1.C# = '001'             LEFT JOIN SC AS T2                       ON SC.S# = T2.S# AND T2.C# = '002'             LEFT JOIN SC AS T3                       ON SC.S# = T3.S# AND T3.C# = '003'             LEFT JOIN SC AS T4                       ON SC.S# = T4.S# AND T4.C# = '004'       WHERE student.S#=SC.S# AND       ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0)       NOT IN       (SELECT             DISTINCT             TOP 15 WITH TIES             ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0)       FROM sc             LEFT JOIN sc AS T1                       ON sc.S# = T1.S# AND T1.C# = 'k1'             LEFT JOIN sc AS T2                       ON sc.S# = T2.S# AND T2.C# = 'k2'             LEFT JOIN sc AS T3                       ON sc.S# = T3.S# AND T3.C# = 'k3'             LEFT JOIN sc AS T4                       ON sc.S# = T4.S# AND T4.C# = 'k4'       ORDER BY ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0) DESC); 23、统计列印各科成绩,各分数段人数:课程ID,课程名称,[100-85],[85-70],[70-60],[ <60]     SELECT SC.C# as 课程ID, Cname as 课程名称        ,SUM(CASE WHEN score BETWEEN 85 AND 100 THEN 1 ELSE 0 END) AS [100 - 85]         ,SUM(CASE WHEN score BETWEEN 70 AND 85 THEN 1 ELSE 0 END) AS [85 - 70]         ,SUM(CASE WHEN score BETWEEN 60 AND 70 THEN 1 ELSE 0 END) AS [70 - 60]         ,SUM(CASE WHEN score < 60 THEN 1 ELSE 0 END) AS [60 -]     FROM SC,Course     WHERE SC.C#=Course.C#     GROUP BY SC.C#,Cname; 24、查询学生平均成绩及其名次      SELECT 1+(SELECT COUNT( distinct 平均成绩)               FROM (SELECT S#,AVG(score) AS 平均成绩                      FROM SC                   GROUP BY S#                   ) AS T1             WHERE 平均成绩> T2.平均成绩) as 名次,       S# as 学生学号,平均成绩    FROM (SELECT S#,AVG(score) 平均成绩            FROM SC         GROUP BY S#         ) AS T2     ORDER BY 平均成绩desc;   25、查询各科成绩前三名的记录:(不考虑成绩并列情况)       SELECT t1.S# as 学生ID,t1.C# as 课程ID,Score as 分数      FROM SC t1       WHERE score IN (SELECT TOP 3 score               FROM SC               WHERE t1.C#= C#             ORDER BY score DESC               )       ORDER BY t1.C#; 26、查询每门课程被选修的学生数  SELECT c#,count(S#) FROM sc GROUP BY C#; 27、查询出只选修了一门课程的全部学生的学号和姓名  SELECT SC.S#,Student.Sname,count(C#) AS 选课数  FROM SC ,Student   WHERE SC.S#=Student.S# GROUP BY SC.S# ,Student.Sname having count(C#)=1; 28、查询男生、女生人数    SELECT count(Ssex) as 男生人数FROM Student GROUP BY Ssex having Ssex='男';     SELECT count(Ssex) as 女生人数FROM Student GROUP BY Ssex having Ssex='女';29、查询姓“张”的学生名单    SELECT Sname FROM Student WHERE Sname like '张%'; 30、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;; 31、年出生的学生名单(注:Student表中Sage列的类型是datetime)     SELECT Sname,  CONVERT(char (11),DATEPART(year,Sage)) as age     FROM student     WHERE  CONVERT(char(11),DATEPART(year,Sage))='1981'; 32、查询每门课程的平均成绩,结果按平均成绩升序排列,平均成绩相同时,按课程号降序排列    SELECT C#,Avg(score) FROM SC GROUP BY C# ORDER BY Avg(score),C# DESC ; 33、查询平均成绩大于的所有学生的学号、姓名和平均成绩    SELECT Sname,SC.S# ,avg(score)     FROM Student,SC     WHERE Student.S#=SC.S# GROUP BY SC.S#,Sname having    avg(score)>85; 34、查询课程名称为“数据库”,且分数低于的学生姓名和分数    SELECT Sname,isnull(score,0)     FROM Student,SC,Course     WHERE SC.S#=Student.S# AND SC.C#=Course.C# AND  Course.Cname='数据库'and score <60; 35、查询所有学生的选课情况;    SELECT SC.S#,SC.C#,Sname,Cname     FROM SC,Student,Course     WHERE SC.S#=Student.S# AND SC.C#=Course.C# ; 36、查询任何一门课程成绩在分以上的姓名、课程名称和分数;    SELECT  distinct student.S#,student.Sname,SC.C#,SC.score     FROM student,Sc     WHERE SC.score>=70 AND SC.S#=student.S#; 37、查询不及格的课程,并按课程号从大到小排列    SELECT c# FROM sc WHERE scor e <60 ORDER BY C# ; 38、查询课程编号为且课程成绩在分以上的学生的学号和姓名;    SELECT SC.S#,Student.Sname FROM SC,Student WHERE SC.S#=Student.S# AND Score>80 AND C#='003'; 39、求选了课程的学生人数    SELECT count(*) FROM sc; 40、查询选修“叶平”老师所授课程的学生中,成绩最高的学生姓名及其成绩    SELECT Student.Sname,score     FROM Student,SC,Course C,Teacher     WHERE Student.S#=SC.S# AND SC.C#=C.C# AND C.T#=Teacher.T# AND Teacher.Tname='叶平' AND SC.score=(SELECT max(score)FROM SC WHERE C#=C.C# ); 41、查询各个课程及相应的选修人数    SELECT count(*) FROM sc GROUP BY C#; 42、查询不同课程成绩相同的学生的学号、课程号、学生成绩  SELECT distinct  A.S#,B.score FROM SC A  ,SC B WHERE A.Score=B.Score AND A.C# <>B.C# ; 43、查询每门功成绩最好的前两名    SELECT t1.S# as 学生ID,t1.C# as 课程ID,Score as 分数      FROM SC t1       WHERE score IN (SELECT TOP 2 score               FROM SC               WHERE t1.C#= C#             ORDER BY score DESC               )       ORDER BY t1.C#; 44、统计每门课程的学生选修人数(超过人的课程才统计)。要求输出课程号和选修人数,查询结果按人数降序排列,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  C# as 课程号,count(*) as 人数    FROM  sc      group  by  C#     order  by  count(*) desc,c#  45、检索至少选修两门课程的学生学号    SELECT  S#      FROM  sc      group  by  s#     having  count(*)  >  =  2 46、查询全部学生都选修的课程的课程号和课程名    SELECT  C#,Cname      FROM  Course      WHERE  C#  in  (SELECT  c#  FROM  sc group  by  c#)  47、查询没学过“叶平”老师讲授的任一门课程的学生姓名    SELECT Sname FROM Student WHERE S# not in (SELECT S# FROM Course,Teacher,SC WHERE Course.T#=Teacher.T# AND SC.C#=course.C# AND Tname='叶平'); 48、查询两门以上不及格课程的同学的学号及其平均成绩    SELECT S#,avg(isnull(score,0)) FROM SC WHERE S# in (SELECT S# FROM SC WHERE score <60 GROUP BY S# having count(*)>2)GROUP BY S#; 49、检索“”课程分数小于,按分数降序排列的同学学号    SELECT S# FROM SC WHERE C#='004'and score <60 ORDER BY score desc; 50、删除“”同学的“”课程的成绩delete FROM Sc WHERE S#='001'and C#='001';  管理员在2009年8月13日编辑了该文章文章。 --> --> 阅读(53) | 评论(0) | 转发(0) | 0 上一篇:[转]SQL语句收藏 下一篇:SQL Server导出导入数据方法 相关热门文章 30岁女教师开宝马下乡教书 每... 澳洲文凭办理加拿大文凭办理,... 澳洲文凭在中国的办理方法... fake diplomas加拿大文凭办理... mysql修改密码 承接自动化测试培训、外包、实... Solaris PowerTOP 1.0 发布 For STKMonitor 项目小体会 busybox的httpd使用CGI脚本(Bu... 怎么样找出BIND中查询并发量多... 可有人在实际的openstack生产... 如下makefile如何编写 sqlldr 参数配置 讨论一下各位所管理的mysql生... 热门推荐 --> 给主人留下些什么吧!~~ 评论热议

上一篇:[转]SQL语句收藏
下一篇:多道程序设计技术

相关文章

相关评论