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

Domain

SQL

Difficulty

medium

Seniority

L4

Problem

For each weekly signup cohort, compute what percentage of users came back and performed an action on day 7 or later. Show the cohort week, total signups, retained users, and retention rate.

Summary

Day one was promising. Day seven tells the truth.

Practice This Problem

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