mysql 字典项做为列

# 创建学生表
create table student(age int,name varchar(32))engine myisam charset utf8;
insert into student values(18,'小白');
# 创建教师表，结构与学生表结构一模一样
create table teacher like student;
# 把学生表的数据写进教师表中
insert into teacher select * from student;
# 创建家长表，结构与数据与学生表一模一样
create table parent select * from student;
#创建学校表，结构与学生表一样
create table school select * from student where 1 = 2;#即条件不成立