unique_toucan_7126
Warden
Top 7.8%
Member Nº 3946
Joined Aug 2026
SQL
JSON Extraction
Type Casting
Group Filtering
Spark
Exploding Arrays
Catalyst Optimizer
Salting Strategy
Data Modeling
Self-Referential
Many-to-Many
One-to-One
Solved
SQL3
Milestones
First milestone at 10 problems solved.
709 runs in the past 26 weeksActive days: 11 · Max streak: 4
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Recent solves
Use a CTE to find active users who signed up on or after January 1, 2024
SQL · medium · lesson
Use a derived table (subquery in FROM) to count occurrences of each event type, then show only those
SQL · medium · lesson
Show each product's name and price alongside the overall average price of all products
SQL · medium · lesson
Find users who have made a transaction exceeding $500 using a subquery
SQL · medium · lesson
Engagement Gap
SQL · medium
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
From products, return product_id, category, price, and the row_number within each category ordered b
SQL · medium · lesson
Show each employee metric's department, metric_value, and the overall average metric_value across al
SQL · medium · lesson
Show each user session's session_id, user_id, and the total number of sessions for that user
SQL · medium · lesson