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Which of the following statements is correct? An exception that has been declared must be referred to in the RAISE statement, or a PL/SQL error will occur. An exception that has not been declared must be referred to in the RAISE statement, or a PL/SQL error will occur. An exception that has been declared must not be referred to in the RAISE statement, or a PL/SQL error will occur. An exception that has been declared must be referred to in the SELECT statement, or a PL/SQL error will occur.

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Which of the following statements is correct? An exception that has been declared must be referred t...

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