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

Domain

SQL

Difficulty

hard

Seniority

L5

Problem

The FinOps team wants to reconcile actual cloud charges against budget allocations on a per-region timeline. Stack both sources together, treating charges as negative and allocations as positive, and compute a running balance per region. Return region, date, amount, and running balance, sequenced by region and date.

Summary

Two cost tables, one region. Reconcile the running balance.

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