QUESTION 28 To be callable from a SQL expression, a user-defined function must do what?
(A) Be stored only in the database.
(B) Have both IN and OUT parameters.
(C) Use the positional notation for parameters.
(D) Return a BOOLEAN or VARCHAR2 data type.

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統計: A(2), B(2), C(3), D(2), E(0) #912590