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Examine the following statement that is used to modify the constraint on the SALES table： SQL> ALTER TABLE SALES MODIFY CONSTRAINT pk DISABLE VALIDATE； Which three statements are true regarding the above command（）
A:The constraint remains valid.
B:The index on the constraint is dropped.
C:It allows the loading of data into the table using SQL*Loader.
D:New data conforms to the constraint， but existing data is not checked
E:It allows the data manipulation on the table using INSERT/UPDATE/DELETE SQL statements.

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出自：Oracle认证

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