Choose two.

Examine this partial command:

CREATE TABLE cust (

cust_id NUMBER(2),

credit_ limit NUMBER(10)

)

ORGANIZATION EXTERNAL

Which two clauses are required for this command to execute successfully?

A) the DEFAULT DIRECTORY clause

B) the REJECT LIMIT clause

C) the LOCATION clause

D) the ACCESS PARAMETERS clause

E) the access driver TYPE clause

Answer：AD

(解析：外部表建表语句，上面 Answer：看起来都对。但是通过测试，发现 E Answer：可以不需要指定，但是 directory 必须要制定，还有访问参数也必须要指定，访问参数里面位置参数必须要指定，其它访问参数可以忽略，这道题考试的意义在哪儿?)