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
Mysql 创建索引的方法：
alter table actor add unique uniq_idx_firstname(first_name);
alter table actor add index idx_lastname(last_name);
sqllite创建索引方法：
create unique index uniq_idx_firstname on actor(first_name);
create index idx_lastname on actor(last_name);
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