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
http://www.nowcoder.com/practice/e1824daa0c49404aa602cf0cb34bdd75
用Myqsl创建唯一索引和普通索引
alter table actor add unique uniq_idx_firstname(first_name);
alter table actor add index idx_lastname(last_name);
