dusdus
Savant
Top 0.9%
Member Nº 5017
Joined Sep 2026
SQL
Window Deduplication
Multiple WINDOWs
Common Table Expressions
Python
Dunder Methods
Stack & Queue
Modules
Spark
Window Frames
Window Deduplication
Multiple Windows
Data Modeling
Metric Additivity
Indexing
Self-Referential
Solved
Milestones
Top 100
Top 4% SQL
Top 6% Python
50 solved
7-day streak
1,101 runs in the past 26 weeksActive days: 26 · Max streak: 7
MayJunJulAugSepOct
Recent solves
Average Spending by Account Status
SQL · medium
User Session Roster
SQL · easy
Above Average Interactions
SQL · easy
Above Average
SQL · easy
30-Day Page View Counts
SQL · easy
Star Schemas, The Star Schema Challenge 2
Data Modeling · medium · lesson
Star Schemas, The Star Schema Challenge 1
Data Modeling · medium · lesson
The Balance Always Reconciles
Data Modeling · easy
Latest Version Per Service
SQL · easy
Beyond 3NF
Data Modeling · medium · lesson