datadriven
Warden
Top 7.8%
SQL
Correlated Subquery
Common Table Expressions
Row Offsets
Python
Lambda
Dunder Methods
Dict Iteration
Spark
Conditional Aggregation
Intermediate DataFrames
Multiple Joins
Data Modeling
SCD Type 2
Self-Referential
Junction Tables
Pipeline Architecture
Medallion Architecture
Deduplication Strategies
Idempotency
Solved
SQL17
Python7
Spark6
Pipeline Architecture5
Data Modeling1
Milestones
Top 10% SQL
Strong Hire
Founder
30 active days
All 5 domains
10 solved
723 runs in the past 26 weeksActive days: 81 · Max streak: 15
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Recent solves
The Final Sale
SQL · medium
Past the Threshold
SQL · medium
Busiest Pipeline Month
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Content Session Counts
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Green Lights on the Order Line
SQL · easy
Only Here
SQL · hard
Highest and Lowest Cloud Costs
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Who's Holding Up Traffic
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Above Average Product Prices
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Big Spenders
SQL · easy