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322. Self JOIN for Employee-Manager Hierarchy

Medium TCS Joins
Query Rules
  • The query columns and order must match the expected result schema.
  • NULL values should be handled appropriately where applicable.
  • The grader compares output values and sorting order to evaluate.

Schema Browser

Click a table's header to toggle expand/collapse.
locations
3 cols
departments
3 cols
employees
6 cols
orders
6 cols

Reference Solution

Expected SQL 
SELECT e.name AS employee, m.name AS manager FROM employees e LEFT JOIN employees m ON e.manager_id = m.id;
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Console Output

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