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

Domain

SQL

Difficulty

medium

Seniority

L4

Problem

Rank all products by rating, keeping only those with a known rating, and take the top 10 tier. Then find every user who purchased one of those products and count how many unique purchases each user made from that tier. Show the top 10 users by purchase count.

Summary

Which users bought the most top-rated products

Practice This Problem

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