hardy_brook_5019
Exemplar
Top 2.2%
Member Nº 3186
Joined Jul 2026
SQL
Common Table Expressions
Approximate Aggregates
Self-Join
Spark
Inequality Joins
Exploding Arrays
Regex Functions
Data Modeling
Self-Referential
Many-to-Many
One-to-One
Solved
SQL1
Milestones
Top 100
7-day streak
872 runs in the past 26 weeksActive days: 14 · Max streak: 13
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Recent solves
Find the average session duration in minutes for each user
SQL · medium · lesson
Show each user's username, transaction ID, and days between signup and transaction using DATE_DIFF
SQL · medium · lesson
Find which day of the week has the most deployments
SQL · medium · lesson
Summarize total transaction revenue by fiscal quarter
SQL · medium · lesson
Count how many users signed up each month
SQL · medium · lesson
Find what hour each user session started
SQL · medium · lesson
Extract the signup year from each user
SQL · medium · lesson
From api_calls, return call_id and REPLACE(endpoint, '/api/', '/') AS short_path
SQL · medium · lesson
From api_calls, return call_id and SUBSTR(endpoint, 1, 8) AS prefix for rows where endpoint LIKE '/a
SQL · medium · lesson
From api_calls, return call_id, endpoint, and STRPOS(SUBSTR(endpoint, 2), '/') AS next_slash for row
SQL · medium · lesson