saber
Warden
Top 7.7%
Member Nº 4896
Joined Sep 2026
SQL
Window Deduplication
Common Table Expressions
Storage Optimization
Python
Modules
Tuples
Iteration
Spark
Window Deduplication
Exploding Arrays
Catalyst Optimizer
Data Modeling
Metric Additivity
Indexing
Constraints
Learned
SQL117
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608 runs in the past 26 weeksActive days: 9 · Max streak: 6
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Recent solves
Combine all content items of type 'article' and type 'video' into a single result set using UNION AL
SQL · medium
Use a CTE to find sessions longer than 2000 seconds and show the username for each
SQL · medium
Use two CTEs to find users who spent more than $1000 total across all transactions
SQL · medium
Use a CTE to find active users who signed up on or after January 1, 2024
SQL · medium
Use a derived table (subquery in FROM) to count occurrences of each event type, then show only those
SQL · medium
Show each product's name and price alongside the overall average price of all products
SQL · medium
Find users who have made a transaction exceeding $500 using a subquery
SQL · medium
Top N Per Group: Beginner
SQL · easy · lesson
Window Functions: Beginner, ROW_NUMBER Challenge 4
SQL · medium · lesson
Window Functions: Beginner, PARTITION BY Deep Dive Challenge 2
SQL · medium · lesson