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Which two statements are true regarding views?（）
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

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出自：Oracle认证

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