The Seventh Day

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

Domain

SQL

Difficulty

medium

Seniority

L4

Problem

A growth team measures how well each monthly signup cohort sticks around: the share of a month's new users who come back to do something a week or more after joining. Report each cohort month, its total signups, how many of those users came back that late, and that share as a percentage.

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 checks it automatically.