视图可以简化语句查询，控制数据访问。

首先练习一个数据查询简单视图。

#创建视图V_city_id 
CREATE VIEW V_city_id AS SELECT "public".city."id" FROM city;
#CREATE VIEW

#Query returned successfully in 322 msec.
#使用视图
SELECT * FROM V_city_id;
```![简单视图](https://static.oschina.net/uploads/img/201710/18103028_QI7w.png "简单视图")

删除视图。

DROP VIEW V_city_id;