Negative Outcome Rate for New Users

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

Domain

SQL

Difficulty

medium

Seniority

L5

Problem

Given a users table with signup dates and an event_data table with event types and timestamps, calculate the fraction of events with a negative outcome out of all events for users who signed up in June 2026, restricted to events that occurred within 14 days of signup. Negative outcomes are events where the event_type is error, timeout, or crash.

Summary

New users have a rough first two weeks.

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