创建索引题解

sqlite创建单列索引语法为：

CREATE INDEX index_name
ON table_name (column_name);

创建唯一索引语法为：

CREATE UNIQUE INDEX index_name
on table_name (column_name);

结合语法格式可得答案如下：

CREATE UNIQUE INDEX uniq_idx_firstname on actor (first_name);
CREATE INDEX idx_lastname ON actor (last_name);