Most Profitable Region Month

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

Domain

SQL

Difficulty

medium

Seniority

L4

Problem

The finance team needs the single most profitable region-month combination in 2026. For each region, sum profit by transaction month, matching orders to transactions by their ID modulo 100. Return whichever region and month came out on top.

Summary

One region, one month. Peak profit.

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