sql语句与 数据库

create  table  wyx(

xh int primary key,

xm varchar(20) not null,

nl int,

zcrq timestamp default current_timestamp,#日期格式

sfzh char(18) unique,

bj varchar(20) not null,

xb enum('男','女')

);

#删表 drop table wyx;

create table kcb(

kch int primary key,

kcm varchar(20) not null

);

create table cjb(

id int auto_increment primary key,

xh int ,foreign key(xh) references wyx(xh),

cj int not null,

kch int ,foreign key(kch) references kcb(kch)

);