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
alter table actor add unique uniq_idx_firstname (first_name);
alter table actor add index idx_lastname (last_name)
记住在sql里面的表名 索引名 列名都不用加‘’
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