SQL语句多表查询.doc

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*/--创建测试数据 create table Student(S# varchar(10),Sname nvarchar(10),Sage datetime,Ssex nvarchar(10))insert into Student values(01 , N赵雷 , 1990-01-01 , N男)insert into Student values(02 , N钱电 , 1990-12-21 , N男)insert into Student values(03 , N孙风 , 1990-05-20 , N男)insert into Student values(04 , N李云 , 1990-08-06 , N男)insert into Student values(05 , N周梅 , 1991-12-01 , N女)insert into Student values(06 , N吴兰 , 1992-03-01 , N女)insert into Student values(07 , N郑竹 , 1989-07-01 , N女)insert into Student values(08 , N王菊 , 1990-01-20 , N女)create table Course(C# varchar(10),Cname nvarchar(10),T# varchar(10))insert into Course values(01 , N语文 , 02)insert into Course values(02 , N数学 , 01)insert into Course values(03 , N英语 , 03)create table Teacher(T# varchar(10),Tname nvarchar(10))insert into Teacher values(01 , N张三)insert into Teacher values(02 , N李四)insert into Teacher values(03 , N王五)create table SC(S# varchar(10),C# 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)go --1、查询01课程比02课程成绩高的学生的信息及课程分数--1.1、查询同时存在01课程和02课程的情况 select a.* , b.score [课程01的分数],c.score [课程02的分数] from Student a , SC b