49.The ORDERS table belongs to the user OE. OE has granted the SELECT privilege on the ORDERS table

49.The ORDERS table belongs to the user OE. OE has granted the SELECT privilege on the ORDERS

table to the user HR.

Which statement would create a synonym ORD so that HR can execute the following query successfully?

SELECT * FROM ord;

A.CREATE SYNONYM ord FOR orders; This command is issued by OE.

B.CREATE PUBLIC SYNONYM ord FOR orders; This command is issued by OE.

C.CREATE SYNONYM ord FOR oe.orders; This command is issued by the database administrator.

D.CREATE PUBLIC SYNONYM ord FOR oe.orders; This command is issued by the database administrator.

答案：D

解析：题目说oe用户有个orders表，并且将该表的select权限给了hr，使用哪一个create命令可

创建一个ord同义词，hr可以直接通过select * from ord来访问，由于ord前面没有加用户名，所以

只能是创建一个hr用户下的ord同义词，或者创建一个public的同义词，因此

A:错误，创建完后，需要加用户名前缀来访问

B:错误，这里不知道OE有没有权限创建，如果有的话，其实也是正确的，主要是单选，并且还有D选项

C:错误，不是public的，且不是hr创建的

D:正确