Data Quality

A hard SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.

Domain

SQL

Difficulty

hard

Seniority

L4

Problem

The data engineering team wants to identify databases with a clean migration record. For each database, compute the total number of migrations and total rollbacks. Only return databases that have never had a rollback.

Summary

Failed checks pile up. Which tables need the most attention?

Practice This Problem

Solve this SQL problem with real code execution. DataDriven runs your SQL queries against a real database and grades it automatically.