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
alter table actor add unique index uniq_idx_firstname(first_name); alter table actor add index idx_lastname(last_name);