1、本题考察表的创建 create table 表名(字段名 字段类型,字段名 字段类型, .....) ,在字段类型后加primary key 设置主键
CREATE table actor(actor_id smallint(5) primary key, first_name varchar(45) not null, last_name varchar(45) not null, last_update date not null);
CREATE table actor(actor_id smallint(5) primary key, first_name varchar(45) not null, last_name varchar(45) not null, last_update date not null);