Oracle PL/SQL interview questions

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1. Patient
Oracle PL/SQL Conditional statements Language features Public

A hospital stores the names of patients and doctors in the following table:

TABLE patients
  patient VARCHAR(100)
  doctor VARCHAR(100) NOT NULL

The hospital refers to a patient whose name is unknown as 'John Doe'. These patients are represented as null in the patients table.

Which of the following queries can be used to select a list of patients ('John Doe' if patient is null) and their doctors?

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