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Self-Join: Employee and Manager
A self-join joins a table to itself. Join the employees table to itself to show each employee alongside their manager. Show emp_name, emp_department, emp_salary, manager_name, and manager_department. Include employees with no manager (CEO). Sort by manager_name, emp_name. Self-joins unlock hierarchical data.
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Schema
employees
| emp_id | name | department | position | salary | hire_date | manager_id | performance_rating |
|---|---|---|---|---|---|---|---|
| 1 | Alice Johnson | Engineering | Senior Developer | 95000 | 2019-03-15 | 5 | 4.5 |
| 2 | Bob Smith | Engineering | Developer | 75000 | 2020-06-01 | 1 | 3.8 |
| 3 | Carol Williams | Marketing | Marketing Manager | 85000 | 2018-09-20 | NULL | 4.2 |
Expected output: Alice | ... | Bob | ...
Hint
Concepts
SELECT Self-Join LEFT JOIN
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