fast_walrus_6434
Arbiter
Top 0.2%
Member Nº 3251
Joined Jul 2026
SQL
Correlated Subquery
Window Deduplication
Common Table Expressions
Python
Recursion
Sliding Window
Two-Pointer
Spark
Collecting Values
Exploding Arrays
Regex Functions
Data Modeling
Metric Additivity
Solved
SQL58
Python47
Spark0
Milestones
Top 10
Top 2% SQL
Top 2% Python
100 solved
30-day streak
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2,726 runs in the past 26 weeksActive days: 47 · Max streak: 46
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Recent solves
Session Logins Dec 13 to 19
SQL · easy
The Line Splitter
Python · easy
From users, return user_id, signup_date, and DATE_DIFF('day', CAST(signup_date AS DATE), DATE '2024-
SQL · medium · lesson
From users, return EXTRACT(MONTH FROM CAST(signup_date AS DATE)) AS signup_month and COUNT(*) AS sig
SQL · medium · lesson
From users, return EXTRACT(YEAR FROM CAST(signup_date AS DATE)) AS signup_year and COUNT(*) AS signu
SQL · medium · lesson
Find total cloud spending by provider for Q1 only (first quarter)
SQL · medium · lesson
Find the peak hours for ad impressions
SQL · medium · lesson
Show deploy timestamps alongside their Unix epoch equivalent
SQL · medium · lesson
Convert server log timestamps to Unix epoch seconds
SQL · medium · lesson
Find the average session duration in minutes for each user
SQL · medium · lesson