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Consider the following SQL query:
SELECT employee_id
FROM employees
WHERE employee_id <> ALL (SELECT manager_id FROM employees);
What does this query return?
  • a)
    All employee IDs who are managers
  • b)
    All employee IDs who are not managers
  • c)
    An error will occur
  • d)
    All employee IDs
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Consider the following SQL query:SELECT employee_idFROM employeesWHERE...
The query selects all employee IDs from the employees table where the employee ID is not present in the manager ID column of the same table.
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Consider the following SQL query:SELECT employee_idFROM employeesWHERE employee_id <> ALL (SELECT manager_id FROM employees);What does this query return?a)All employee IDs who are managersb)All employee IDs who are not managersc)An error will occurd)All employee IDsCorrect answer is option 'B'. Can you explain this answer?
Question Description
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