数据库上课 第四讲 SQL语言_1(DDL及建立数据库).ppt

课程表Course CREATE TABLE Course ( /* 定义课程表Course*/ courseNo char(3) NOT NULL , /*课程号*/ courseName varchar(30) NOT NULL, /*课程名*/ creditHour numeric(1) default 0 NOT NULL, /*学分*/ courseHour tinyint default 0 NOT NULL, /*课时数*/ priorCourse char(3) NULL, /*先修课程*/ CONSTRAINT CoursePK PRIMARY KEY (courseNo), FOREIGN KEY (priorCourse) REFERENCES Course(courseNo) ) 学生表Student CREATE TABLE Student ( studentNo char(7) NOT NULL , /*学号*/ studentName varchar(20) NOT NULL , /*姓名*/ sex char(2) NULL, /*性别*/ birthday datetime NULL, /*出生日期*/ native varchar(20) NULL, /*籍贯*/ nation varchar(30) default 汉族 NULL, /*民族*/ classNo char(6) NULL, /*所属班级*/ CONSTRAINT StudentPK PRIMARY KEY (studentNo), CONSTRAINT StudentFK FOREIGN KEY (classNo) REFERENCES Class(classNo)) 定义成绩表Score CREATE TABLE Score ( studentNo char(7) NOT NULL , /*学号*/ courseNo char(3) NOT NULL , /*课程号*/ score numeric(5, 1) default 0 NOT NULL, /*成绩*/ CHECK( score BETWEEN 0.0 AND 100.0) , /*自定义约束 */ /* 主码由两个属性构成，必须作为表级完整性约束进行定义*/ CONSTRAINT ScorePK PRIMARY KEY (studentNo, courseNo), CONSTRAINT ScoreFK1 FOREIGN KEY (studentNo) REFERENCES student(studentNo), CONSTRAINT ScoreFK2 FOREIGN KEY (courseNo) REFERENCES course(courseNo) ) * * 附4 插入数据 语法 INSERT INTO tableName [ (columnNa