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#0321
Employee Manager Names
MediumSQL24 min20 XP
Problem
Return employee name and manager name for employees who have a manager.
Why This Matters
SQL interviews usually test whether you can turn a business question into the right rows, grouping level, join type, and edge-case behavior.
Schema
employees(employee_id INTEGER, name TEXT, manager_id INTEGER)
Examples
Example 1
InputNoah and Omar report to Mira
OutputNoah/Mira, Omar/Mira
The same employees table is used once for employees and once for managers.
Constraints
- Return only the requested columns.
- Use deterministic ORDER BY when multiple rows are returned.
- Assume SQLite-compatible SQL unless the prompt states otherwise.
CodeSQL
Visible browser tests run here when available.
Testcases1 visible / 3 hidden categories
Core SQL case
InputNoah and Omar report to Mira
Expected[["Noah","Mira"],["Omar","Mira"]]
The same employees table is used once for employees and once for managers.
Hidden Test Categories
Empty or missing matchesDuplicate rows or tiesNULL values where the pattern commonly breaks