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1、多表查询sql语句countSQL语句多表查询SQL语句多表查询：问题及描述：--1.学生表Student(S#,Sname,Sage,Ssex)--S#学生编号,Sname学生姓名,Sage出生年月,Ssex学生性别--2.课程表Course(C#,Cname,T#)--C#--课程编号,Cname课程名称,T#教师编号--3.教师表Teacher(T#,Tname)--T#教师编号,Tname教师姓名--4.成绩表SC(S#,C#,score)--S#学生编号,C#课程编号,score分数*/--创建测
2、试数据createtableStudent(S#varchar(10),Snamenvarchar(10),Sagedatetime,Ssexnvarchar(10))insertintoStudentvalues('01',N'赵雷','1990-01-01',N'男')insertintoStudentvalues('02',N'钱电','1990-12-21',N'男')in
3、sertintoStudentvalues('03',N'孙风','1990-05-20',N'男')insertintoStudentvalues('04',N'李云','1990-08-06',N'男')insertintoStudentvalues('05',N'周梅','1991-12-01',N'女')ins
4、ertintoStudentvalues('06',N'吴兰','1992-03-01',N'女')insertintoStudentvalues('07',N'郑竹','1989-07-01',N'女')insertintoStudentvalues('08',N'王菊','1990-01-20',N'女')crea
5、tetableCourse(C#varchar(10),Cnamenvarchar(10),T#varchar(10))insertintoCoursevalues('01',N'语文','02')insertintoCoursevalues('02',N'数学','01')insertintoCoursevalues('03',N'英语','03')createt
6、ableTeacher(T#varchar(10),Tnamenvarchar(10))insertintoTeachervalues('01',N'张三')insertintoTeachervalues('02',N'李四')insertintoTeachervalues('03',N'王五')createtableSC(S#varchar(10),C#varchar(10),scoredecimal(18,1
7、))insertintoSCvalues('01','01',80)insertintoSCvalues('01','02',90)insertintoSCvalues('01','03',99)insertintoSCvalues('02','01',70)insertintoSCvalues('02','02',60)insertintoSCva
8、lues('02','03',80)insertintoSCvalues('03','01',80)insertintoSCvalues('03','02',80)insertintoSCvalues('03','03',80)insertintoSCvalues('04'
