数据类操作#### insert#=====insert into student(sname,gender,class_id) values(‘ls‘,‘男‘,1)insert into class(caption) values(‘python1班‘)insert into teacher(tname) values(‘alex‘)insert into course(cname,tearch_id) values(‘python‘,1)insert into score(student_id,corse_id,number) values(4,3,60); update=====update score set number=87 where sid=1; delete===delete from score where sid=1; selec...