1. 基本描述
本章内容主要包括如何创建数据库及如何建表。
2. 基本样例
CREATE TABLE person ( person_id SMALLINT UNSIGNED, fname VARCHAR(20), lname VARCHAR(20), gender ENUM('M', 'F'), birth_date DATE, street VARCHAR(20), city VARCHAR(20), state VARCHAR(20), country VARCHAR(20), postal_code VARCHAR(20), CONSTRAINT pk_person PRIMARY KEY (person_id) ); DESC person; 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) ); DESC favorite_food; ALTER TABLE person MODIFY person_id SMALLINT UNSIGNED AUTO_INCREMENT; DESC person; INSERT INTO person (person_id, fname, lname, gender, birth_date) VALUES (null, "William", 'Turner', 'M', '1972-05-27'); SELECT person_id, fname, lname, birth_date FROM person; SELECT person_id, fname, lname, birth_date FROM person WHERE person_id = 1; SELECT person_id, fname, lname, birth_date FROM person WHERE lname = 'Turner'; INSERT INTO favorite_food (person_id, food) VALUES (1, 'pizza'); INSERT INTO favorite_food (person_id, food) VALUES (1, 'cookies'); INSERT INTO favorite_food (person_id, food) VALUES (1, 'nachos'); SELECT food FROM favorite_food WHERE person_id = 1 ORDER BY food; INSERT INTO person (person_id, fname, lname, gender, birth_date, street, city, state, country, postal_code) VALUES (null, 'Susan', 'Smith', 'F', '1975-11-02', '23 Maple St.', 'Arlington', 'VA', 'USA', '20220'); SELECT person_id, fname, lname, birth_date FROM person; UPDATE person SET street = '1225 Tremont St.', city = 'Boston', state = 'MA', country = 'USA', postal_code = '02138', WHERE person_id = 1; DELETE FROM person WHERE person_id = 2; INSERT INTO person (person_id, fname, lname, gender, birth_date) VALUES (1, 'Charles', 'Fulton', 'M', '1968-01-15'); INSERT INTO favorite_food (person_id, food) VALUES (999, 'lasagna'); UPDATE person SET gender = 'z' WHERE person_id = 1; UPDATE person SET birth_date = 'DEC-21-1980' WHERE person_id = 1; UPDATE person SET birth_date = str_to_date('DEC-21-1980', '%b-%d-%Y') WHERE person_id = 1; SHOW TABLES; DROP TABLE; DROP TABLE favorite_food; DROP TABLE person; DESC customer;