create view actor_name_view( first_name_v , last_name_v ) as select first_name ,last_name from actor
/*针对actor表创建视图actor_name_view,只包含first_name以及last_name两列,
并对这两列重新命名,first_name为first_name_v,last_name修改为last_name_v:
创建视图:
CREATE VIEW 视图名(列1,列2...)
AS SELECT 列1,列2...
FROM ...;
*/