Double Take

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

Domain

SQL

Difficulty

medium

Seniority

L3

Problem

A downstream team flagged that the data quality checks table has rows repeating the same table-and-column combination. Surface every pair that appears more than once along with how many times it shows up, worst offenders first. Include each pair's standing among the offenders and its share of all the duplicated records.

Summary

Passed QA twice. That's the problem.

Practice This Problem

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