摘要： 建数据库create database school--建表 use school create table students (s_id int identity(1,1) primary key,--设主键，为自增id s_name varchar(20) not null, s_classId int )create table class ( c_id int identity(1,1) primary key,--设主键，为自增id c_className varchar(20) not null )create table student_Score ( ss_id int ide 阅读全文