SQL可以对视图进行加密.也就是,可永久隐藏视图定义的文本. 注意 此操作不可逆.加密视图后,无法再修改它,因为无法再看到视图定义.如果需要修改加密视图,则必须删除它并重新创建另一个视图. 示例代码: create view userFt as select users.userID,users.userName,users.ftNum,ft.Subject,ft.Content from users inner join ft on users.userID=ft.userID go al…
A very rough performance comparison is performed in ER9/001. Comparison scenario The two below operations are compared: (1) table ZCOMM_PRODUCT2 This is a very simple table which has only three fields. All of the fields are mapped from MARA. (2) tabl…