Question: What does the following SQL query do ? SELECT employee _ id FROM employees UNION ALL SELECT employee _ id FROM former _ employees; Retrieves

What does the following SQL query do?
SELECT employee_id FROM employees UNION ALL
SELECT employee_id FROM former_employees;
Retrieves employee IDs from both 'employees' and 'former_employees' tables, including duplicates.
Retrieves employee IDs from both 'employees' and 'former_employees' tables, removing duplicates.
Retrieves all employee IDs from both 'employees' and 'former_employees' tables, including duplicates.
Retrieves all employee IDs from the 'employees' table.
What does the following SQL query do? SELECT employee_id FROM employees

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