1.主鍵建立:

PRIMARY KEY:
create table tb(
    id int PRIMARY KEY
)

2.外鍵建立:

FOREIGN KEY (id) REFERENCES tb(id): 
CREATE TABLE a(
    id INT AUTO_INCREMENT PRIMARY KEY,
    CONSTRAINT aaa FOREIGN KEY (id) REFERENCES tb(tid)
)

3.自增序列:

AUTO_INCREMENT:
CREATE TABLE a(
    id INT AUTO_INCREMENT PRIMARY KEY
 
,
)

4.數據庫引擎:

ENGINE=INNODB:
支持事物的數據庫引擎

5.默認編碼格式

DEFAULT CHARSET=utf8

MySQL-主外鍵