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Servers Returning to Origin
A medium SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.
- Domain
- SQL
- Difficulty
- medium
- Seniority
- mid, senior
Problem
How many servers ended up back in their original region? 'Original' means the region of their first recorded migration, and 'ended up' means the region of their last. Return a single count.
Practice This Problem
Solve this SQL problem with real code execution. DataDriven runs your SQL queries against a live PostgreSQL database and grades it instantly.