Adopters Before Migration

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

Domain

SQL

Difficulty

hard

Seniority

L5

Problem

The product team is measuring organic adoption of the new editor versus the classic editor. In the page views data, visits to the new editor appear under the URL 'new_editor' and visits to the classic editor under 'classic_editor'. Identify users who visited the new editor but had never visited the classic editor before their first new editor visit. Return their user IDs.

Summary

They used the old feature. Did they ever touch the new one?

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