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#0378
Users With All Required Events
MediumSQL24 min20 XP
Problem
Return user_id values that have all required events: view, click, and purchase.
Why This Matters
SQL interviews usually test whether you can turn a business question into the right rows, grouping level, join type, and edge-case behavior.
Schema
events(user_id INTEGER, event_name TEXT)
Examples
Example 1
Inputonly user 1 has all three required events
Outputuser 1
COUNT DISTINCT over the required set must equal the number of required events.
Constraints
- Return only the requested columns.
- Use deterministic ORDER BY when multiple rows are returned.
- Assume SQLite-compatible SQL unless the prompt states otherwise.
CodeSQL
Visible browser tests run here when available.
Testcases1 visible / 3 hidden categories
Core SQL case
Inputonly user 1 has all three required events
Expected[[1]]
COUNT DISTINCT over the required set must equal the number of required events.
Hidden Test Categories
Empty or missing matchesDuplicate rows or tiesNULL values where the pattern commonly breaks