假设我有这两个表:Store 和 Product。我希望我的商店有一个产品列表。我该怎么做?
create table store(
id int unsigned not null auto_increment,
store_name varchar(30) not null,
product_list_FK int unsigned not null,
primary key(id)
);
create table product(
id int unsigned not null auto_increment,
product_name varchar(30) not null,
price float not null,
primary key(id)
);
我开始了类似的事情,但我不知道如何结束,你们能帮帮我吗?
最佳答案
多对一(产品只能有一个商店)
create table store(
id int unsigned not null auto_increment,
store_name varchar(30) not null,
primary key(id)
);
Query OK, 0 rows affected (0.02 sec)
create table product(
id int unsigned not null auto_increment,
store_id int unsigned not null,
product_name varchar(30) not null,
price float not null,
primary key(id),
constraint product_store foreign key (store_id) references store(id)
);
Query OK, 0 rows affected (0.02 sec)
多对多(产品可以在很多商店)
create table store(
id int unsigned not null auto_increment,
store_name varchar(30) not null,
primary key(id)
);
Query OK, 0 rows affected (0.04 sec)
create table product(
id int unsigned not null auto_increment,
store_id int unsigned not null,
product_name varchar(30) not null,
price float not null,
primary key(id)
);
Query OK, 0 rows affected (0.01 sec)
create table product_store (
product_id int unsigned not null,
store_id int unsigned not null,
CONSTRAINT product_store_store foreign key (store_id) references store(id),
CONSTRAINT product_store_product foreign key (product_id) references product(id),
CONSTRAINT product_store_unique UNIQUE (product_id, store_id)
)
Query OK, 0 rows affected (0.02 sec)
关于mysql - 如何使用 N :M relationship in MySQL? 创建表,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/43990459/