题解 | 对first_name创建唯一索引uniq_idx_firstname
对first_name创建唯一索引uniq_idx_firstname
https://www.nowcoder.com/practice/e1824daa0c49404aa602cf0cb34bdd75
create unique index uniq_idx_firstname on actor(first_name); create index idx_lastname on actor(last_name);
create unique index 创建唯一索引
create index 创建普通索引
