中国唯一一家专业只做ARACLE认证和BDA实训的甲骨文金牌合作企业
中国唯一一家专业只做ARACLE认证和BDA实训的甲骨文金牌合作企业
OCP 11g试题解析：1Z0-051-041题，完整题库请点击这里联系老师咨询了解
41. Which two statements are true regarding views? (Choose two.)
A. A subquery that defines a view cannot include the GROUP BY clause.
B. A view that is created with the subquery having the DISTINCT keyword can be updated.
C. A view that is created with the subquery having the pseudo column ROWNUM keyword cannot
be updated.
D. A data manipulation language ( DML) operation can be performed on a view that is created with
the subquery having all the NOT NULL columns of a table.
Answer: CD
试题解析：
A错误，创建视图的子查询可以使用group by子句。
B错误，子查询中带有DISTINCT 不能对视图进行DML操作。
C正确，子查询中带有ROWNUM 关键字不能对视图进行DML操作。
D正确，所有非空列都可以进行DML操作。
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