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);
另一种方法
alter table actor add unique uniq_idx_firstname（first_name）;
alter table actor add index idx_lastname (last_name);
