safe_jackal_1602
Warden
Top 7.8%
Member Nº 4459
Joined Aug 2026
SQL
Window Deduplication
Common Table Expressions
Storage Optimization
Python
Dict Methods
Unpacking
Functions
Spark
Window Frames
Window Deduplication
First & Last Values
Data Modeling
Self-Referential
Indexing
Many-to-Many
Solved
SQL22
Python2
Data Modeling0
Milestones
Top 7% SQL
10 solved
7-day streak
574 runs in the past 26 weeksActive days: 12 · Max streak: 8
MarAprMayJunJulAugSep
Recent solves
Customer records were stored without a unique identifier, and now there are duplicates
Data Modeling · medium · lesson
Who Stayed
SQL · hard
The Freshest Record
SQL · medium
The Blind Spot
SQL · medium
The Row Count Surprise
SQL · easy
Daily Error Count Change
SQL · medium
The Rolling Peak
Python · medium
Cloud Cost Trend Analysis
SQL · medium
Bargains and Budget-Busters
SQL · hard
7-Check Rolling Average
SQL · medium