視圖:VIEW
虛表
創建方法:
CREATE
VIEW view_name [(column_list)]
AS select_statement
[WITH [CASCADED | LOCAL] CHECK OPTION]
刪除視圖:
DROP VIEW [IF EXISTS]
view_name [, view_name] ...
[RESTRICT | CASCADE]
視圖中的數據事實上存儲於“基表”中,因此,其修改操作也會針對基表實現;其修改操作受基表限制;