MYSQL建表语法（主键，外键，联合主键）

在看《Learning SQL》第二版，

慢慢打实SQL的基础。

建表一：

CREATE TABLE person (person_id SMALLINT UNSIGNED, fname VARCHAR(20), lname VARCHAR(20), gender ENUM('M', 'F'), birth_date DATE, street VARCHAR(30), city VARCHAR(20), state VARCHAR(20), country VARCHAR(20), postal_code VARCHAR(20), CONSTRAINT pk_person PRIMARY KEY (person_id) );

建表二：

CREATE TABLE favorite_food (person_id SMALLINT UNSIGNED, food VARCHAR(20), CONSTRAINT pk_favorite_food PRIMARY KEY (person_id, food), CONSTRAINT fk_fav_food_person_id FOREIGN KEY (person_id) REFERENCES person (person_id) );