strong_flame_9405
Warden
Top 7.7%
Joined Sep 2026
SQL
Storage Optimization
Aggregate Window Fns
Window Deduplication
Python
Tuples
String Formatting
Variables
Spark
Window Deduplication
Multiple Windows
Inequality Joins
Data Modeling
Indexing
Metric Additivity
Constraints
Solved
SQL26
Milestones
Top 5% SQL
10 solved
First interview
574 runs in the past 26 weeksActive days: 8 · Max streak: 2
MarAprMayJunJulAugSep
Recent solves
Lowest Average Price Category
SQL · easy
Where Quality Breaks
SQL · easy
Joins: Intermediate
SQL · medium · lesson
Return username and SUM(total_amount) AS total_spent for users whose account_status is 'active' usin
SQL · medium
Joins: Intermediate
SQL · medium · lesson
Find usernames that have NO transactions
SQL · medium
Return username and the count of transactions per user using LEFT JOIN so users with no transactions
SQL · medium
Joins: Intermediate
SQL · medium · lesson
Joins: Intermediate, Multiple JOINs Challenge 6
SQL · medium · lesson
List every product alongside the buyer's username and the transaction amount
SQL · medium