數(shù)據(jù)庫(kù)表格的創(chuàng)建.doc

課后習(xí)題名稱：學(xué)生選課管理系統(tǒng)（stuCourse）create database stuCourse;1、創(chuàng)建名為stuCourse的數(shù)據(jù)庫(kù)。create database stuCourse;2、向stuCourse數(shù)據(jù)庫(kù)里創(chuàng)建三張表，表名分別為：stu（學(xué)生信息表）、sc（選課表）、teacher（教師信息表）學(xué)生表（stu）結(jié)構(gòu)列名說(shuō)明數(shù)據(jù)類型長(zhǎng)度是否允許為空sno學(xué)號(hào),主鍵char6否sname學(xué)生姓名char10否sex性別char2是age年齡int是dept所在系char20是use stuCoursecreate table stu( sno char(6) not null primary key, sname char(10) not null, sex char(2) null, age int null, dept char(20) null)選課表（sc）結(jié)構(gòu)列名說(shuō)明數(shù)據(jù)類型長(zhǎng)度是否允許為空sno學(xué)號(hào),主鍵char6否score分?jǐn)?shù)float否courseid課程編號(hào)char8否create table sc( sno char(6) not null primary key , score float not null, courseid char(8) not null)教師信息表（teacher）結(jié)構(gòu)列名說(shuō)明數(shù)據(jù)類型長(zhǎng)度是否允許為空tno教師編號(hào)char8否tname教師姓名char8否prof職稱char10是salary薪水float是dept所在系char20是create table teacher( tno char(8) not null primary key, tname char(8) not null, prof char(10) , salary float , dept varchar(20)3、向表stu中增加新的一列家庭住址address。4、把表stu中的年齡age的數(shù)據(jù)類型改為tinyint。5、利用insert語(yǔ)句向以上三個(gè)表插入數(shù)據(jù)。數(shù)據(jù)如下：表stu中的數(shù)據(jù)：snosnamesexagedept1001宋江男25計(jì)算機(jī)系3002張明男23生物系1003李小鵬男26計(jì)算機(jī)系1004鄭冬女25計(jì)算機(jī)系4005李小紅女27工商管理5006趙紫月女24外語(yǔ)系插入stu表 中insert into stu values ( 1001,宋江,男,25,計(jì)算機(jī)系 );insert into stu values ( 3002,張明,男,23,生物系 ); insert into stuvalues ( 1003,李小鵬,男,26,計(jì)算機(jī)系 );insert into stu values ( 1004,鄭冬,女,25,計(jì)算機(jī)系 );insert into stu values ( 4005,李小紅,女,27,工商管理 );insert into stu values ( 5006,趙紫月,女,24,外語(yǔ)系 )表sc中的數(shù)據(jù)：Snoscorecourseid100167C1300278C3100389C1100456C2400587C45006C1插入sc表中insert into scvalues (1001, 67, C1),(3002, 78, C3),(1003,89, C1),(1004, 56, C2),(4005, 87, C4),(5006, 0, C1)表teacher中的數(shù)據(jù)：Tnotnameprofsalarydept3102李明初級(jí)2500計(jì)算機(jī)系4105張小紅中級(jí)3500工商管理5102宋力月高級(jí)3500物理系3106趙明陽(yáng)初級(jí)1500地理系7108張麗高級(jí)3500生物系9103王彬高級(jí)3500計(jì)算機(jī)系7101王力號(hào)初級(jí)1800生物系插入teacher表中insert into teachervalues (3102,李明,初級(jí),2500,計(jì)算機(jī)系);insert into teachervalues (4105,張小紅,中級(jí),3500,工商管理);insert into teachervalues (5102,宋力月,高級(jí),3500,物理系);insert into teachervalues (3106,趙明陽(yáng),初級(jí),1500,地理系);insert into teachervalues (7108,張麗,高級(jí),3500,生物系);insert into teachervalues (9103,王彬,高級(jí),3500,計(jì)算機(jī)系);insert into teachervalues (7101,王力號(hào),初級(jí),1800,生物系)6、將所有學(xué)生年齡增加1歲。Update（更新） stu（表名） set age =age+1；7、刪除張小紅教師的記錄。delete from teacher where tname=張小紅；8、將所有職工工資增加100；update teacher set salary =salary+100；9、使用SQL命令刪除teacher中編號(hào)為9103的職工信息。delete from teacher where tno=9103;10、刪除所有工資收入大于3000的員工信息delete from teacher where salary3000；1