The following data definition defines an organization's employee hierarchy.

An employee is a manager if any other employee has their managerId set to this employee's id. That means John is a manager if at least one other employee has their managerId set to John's id.

TABLE employees
  managerId INTEGER
  FOREIGN KEY (managerId) REFERENCES employees(id)

Write a query that selects only the names of employees who are not managers.

See the example case for more details.

Select database engine:

  •   Example case: Wrong answer
  •   No managers: Wrong answer
  •   Workers have managers: Wrong answer
  •   Managers have managers: Wrong answer

SQL Conditions Select Subqueries Public


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