--pm_stu 插入数据
insert into pm_stu values('1','张三');
insert into pm_stu values('2','李四');
insert into pm_stu values('3','王五');
insert into pm_stu values('4','赵六');
--pm_ci 插入数据
insert into pm_ci values('1','1,2,3,4');
insert into pm_ci values('2','1,4');
