Which of the following is true regarding Null Value?

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• Inorder to simplify the null value confusion in the rank function we can specify
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• View the Exhibit and examine the structure of the EMPLOYEES and DEPARTMENTS tables. Which SET operator would you use in the blank space in the following SQL statement to list the departments where all the employees have managers? SELECT department_id FROM departments ____ SELECT department_id FROM employees WHERE manager_id IS NULL;
• ______states that primary keys should not be null:
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• An ____________ consists of a search-key value and pointers to one or more records with that value as their search-key value.
• Which of the following in true regarding Referential Integrity?
• Which of the following in true regarding Referential Integrity?