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Oracle Database and SQL Fundamentals

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Multiple Choice

A table called EMPLOYEE has the following columns: name, department, and phone_number. Which of the following can limit read access to the phone_number column?

  1. Using a view to access the table
  2. Using a referential constraint on the table
  3. Revoking access from the phone_number column
  4. Defining a table check constraint on the table
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