primary last localtime highlight subject rim ast eat pri

題目描述

針對如下表actor結構創建索引：
CREATE TABLE IF NOT EXISTS actor (
actor_id smallint(5) NOT NULL PRIMARY KEY,
first_name varchar(45) NOT NULL,
last_name varchar(45) NOT NULL,
last_update timestamp NOT NULL DEFAULT (datetime(‘now‘,‘localtime‘)))
對first_name創建唯一索引uniq_idx_firstname，對last_name創建普通索引idx_lastname SQL:

create unique index uniq_idx_firstname on actor(first_name);
create index idx_lastname on actor(last_name);

　　

SQL-37 創建索引