题解 | #对first_name创建唯一索引#
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); #前半句是创建索引键名，后半段是基于某表的某字段，字段外的括号是必须的# create index idx_lastname on actor (last_name);
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