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

An employee is a manager if any other employee has their managerId set to the first employees id. An employee who is a manager may or may not also have a manager.

TABLE employees
  id INTEGER NOT NULL PRIMARY KEY
  managerId INTEGER REFERENCES employees(id)
  name VARCHAR(30) NOT NULL

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

See the example case for more details.

SQLite 3.19.3 
 

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

Tags
SQL Subqueries Public
Hard

7min

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