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#0362
Users Above Global Average Orders
MediumSQL24 min20 XP
Problem
Return user_id and order_count for users whose order count is above the average order count across users with orders.
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
orders(order_id INTEGER, user_id INTEGER)
Examples
Example 1
Inputcounts are 3, 1, 1
Outputuser 1 only
The average count is 1.67, so only 3 is above average.
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
Inputcounts are 3, 1, 1
Expected[[1,3]]
The average count is 1.67, so only 3 is above average.
Hidden Test Categories
Empty or missing matchesDuplicate rows or tiesNULL values where the pattern commonly breaks