项目购物表

创建购物车

create table carts(

id int unsingned primary key auto_INCREMENT,

customer_id int unsigned not null

)charset utf8;

创建购物项表

create table cart_detail(

id int unsigned primary key auto_increment,

cart_id int unsigned not null,

good_id int unsigned not null,

quantity int unsigned not null comment '数量',

price decimal(10,2) not null comment '价格'

)charset utf8;

插入

insert into customers values(0,'东哥','山东','123456');

insert into customers values(0,'源哥','山东','654321');

insert into  carts values (0,2);

insert into cart_detall values(0,1,22,,4999x);

select * from cart_detall

select * from carts as c,cart_detail as d where c.cusromer_id = 2 and d.good_id = 22 ;   #有

select * from carts as c,cart_detail as d where c.cusromer_id = 2 and d.good_id = 21 ;   #无