多对多关联sql语句.txt

刚用java做的网上购物车 做毕业论文用的 有需要的朋友可以参考下

drop table categorys;
create table categorys(
    id    bigint    primary key,
    name  varchar(10)
);

drop table items;
create table items(
    id    bigint   primary key,
    name  varchar(10),
    price  integer
);



drop table link_c_i;
create table link_c_i(
    c_id    bigint  
            references   categorys(id),
    i_id    bigint 
            references   items(id),
    constraint primary key(c_id,i_id)
);