关于数据库的语句该怎样写·答:create table student(sno char(5) primary key,sname varchar(20),ssex bit,sage numeric(2,0),sdept varchar(20));create table course(cno char(3) primary key,cname varchar(16),cpno char(23),ccredit numeric(1,0));create table sc(sno char(5),cno char(3),grade numeric(5,1)...