hardy_bison_1267
Exemplar
Top 2.2%
Member Nº 4337
Joined Aug 2026
SQL
Correlated Subquery
Multiple WINDOWs
Array Transforms
Python
Frequency Counting
List Comprehension
String Methods
Spark
Cost Optimization
Data Modeling
Self-Referential
Many-to-Many
One-to-One
Pipeline Architecture
Medallion Architecture
Event Streaming Platforms
Retry & Failure Handling
Solved
Python7
SQL0
Spark0
Pipeline Architecture0
Milestones
Top 100
1,046 runs in the past 26 weeksActive days: 17 · Max streak: 6
MarAprMayJunJulAugSep
Recent solves
Two Sets of Books
Pipeline Architecture · medium · lesson
A two-person team has Stripe, a Python ETL, and a Looker dashboard wired straight to the ETL
Pipeline Architecture · medium · lesson
A dashboard is currently streamed at sub-second cost, but the business only looks at it twice a day
Pipeline Architecture · medium · lesson
One Bad Record
Pipeline Architecture · medium · lesson
Two Versions of the Truth
Pipeline Architecture · medium · lesson
Two Clocks
Pipeline Architecture · medium · lesson
Once an Hour
Pipeline Architecture · medium · lesson
Before It Clears
Pipeline Architecture · medium · lesson
Count in-stock products per category
Spark · medium · lesson
Sized by config: average price per category
Spark · medium · lesson