polar_mink_5380
Warden
Top 7.8%
Member Nº 2295
Joined Jun 2026
SQL
Window Deduplication
Multiple WINDOWs
Storage Optimization
Spark
Window Deduplication
Multiple Windows
Exploding Arrays
Data Modeling
Self-Referential
Many-to-Many
One-to-One
Learned
SQL117
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Recent solves
Calculate a running total of transaction amounts ordered by date.
SQL · medium · lesson
Calculate a running total of transaction amounts ordered by date
SQL · medium · lesson
Where You Stand
SQL · easy · lesson
Service Alert Frequency
SQL · easy · lesson
Alert Severity
SQL · hard · lesson
User Age Ranking
SQL · easy · lesson
The Opening Run
SQL · easy · lesson
Most Recent Token Usage
SQL · easy · lesson
From products, return product_id, category, price, and COUNT(*) OVER (PARTITION BY category) as item
SQL · medium · lesson
From products, return product_id, category, price, and the RANK within each category ordered by pric
SQL · medium · lesson