MySQL----商品表及商品分类表例子

1.建库

2.建表

新建一个查询，粘贴下列代码，选中执行

#商品分类表
CREATE TABLE category(
 cid INT PRIMARY KEY,
 cname VARCHAR(50)
);

#商品表
CREATE TABLE products(
    pid INT PRIMARY KEY,
    pname VARCHAR(50),
    price DOUBLE,
    flag VARCHAR(2),   #是否上架标记为：1表示上架、0表示下架
    category_id INT,
    CONSTRAINT products_fk FOREIGN KEY (category_id) REFERENCES category (cid)
);

###################商品分类#####################
INSERT INTO category(cid,cname) VALUES(\'1\',\'家电\');
INSERT INTO category(cid,cname) VALUES(\'2\',\'服饰\');
INSERT INTO category(cid,cname) VALUES(\'3\',\'化妆品\');

##########商品###    #商品id#商品名称#商品价格#商品状态#商品所属分类
#全为上架状态
INSERT INTO products(pid,pname,price,flag,category_id) VALUES(\'1\',\'联想\',5000.00,\'1\',1);
INSERT INTO products(pid,pname,price,flag,category_id) VALUES(\'2\',\'海尔\',3000.00,\'1\',1);
INSERT INTO products(pid,pname,price,flag,category_id) VALUES(\'3\',\'雷神\',7000.00,\'1\',1);

INSERT INTO products(pid,pname,price,flag,category_id) VALUES(\'4\',\'JACK_JONES\',800.00,\'1\',2);
INSERT INTO products(pid,pname,price,flag,category_id) VALUES(\'5\',\'真维斯\',200.00,\'1\',2);
INSERT INTO products(pid,pname,price,flag,category_id) VALUES(\'6\',\'花花公子\',450.00,\'1\',2);
INSERT INTO products(pid,pname,price,flag,category_id) VALUES(\'7\',\'劲霸\',700.00,\'1\',2);

INSERT INTO products(pid,pname,price,flag,category_id) VALUES(\'8\',\'香奈儿\',2680.00,\'1\',3);
INSERT INTO products(pid,pname,price,flag,category_id) VALUES(\'9\',\'相宜本草\',590.00,\'1\',3);

商品分类表：（主键没有自增）

商品表：（主键没有自增）

模型图：

1.建库

2.建表

3.交叉查询