Concept Questions | StrataScratch

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574 questions


Trie and Binary Tree	Medium
Impute Missing Information	Medium	Airbnb
Linked list and Array	Medium	Amazon
Python List	Easy
Missing Values PostgreSQL	Easy
Left Join and Right Join	Easy	Block
Version Control	Medium	Capital One
Terabyte of Data	Hard
What is X	Easy	Citadel
Database Normalization	Medium
Scalable Data Science	Medium
Table Joins	Medium
Missing Values in Data Set	Easy	DoorDash
Python Dictionary	Easy
Square Root of Two	Easy
Dealing with Missing Values	Easy
Join and Relate	Easy
Sorted Vectors	Easy
Union Versus Union All	Medium	Meta
Views and storage space	Medium	Meta
Comprehension in Python	Easy	Pearson
Inter-Dependencies of Python libraries	Easy	Pearson
Python Generators	Hard
DELETE and TRUNCATE	Easy
UNION and UNION ALL	Easy
Common Table Expression	Easy
Denormalized Database	Easy
WHERE and HAVING	Easy
Idempotent Pipeline Step	Easy
Data Structures in Python	Easy
N-gram	Easy	Yelp
Canary and Rollback for a Ranking Model	Medium	Amazon
Database for Customer Address	Medium
Order Header or Order Line: Which Grain?	Medium	Amazon
Replacements Recommendation	Medium
Slowly Changing Seller Dimension	Medium	Amazon
Robot Fleet Data Collection	Medium
Track Store: Memory or Database?	Medium	Anduril
Drone Fleet Task Assignment	Hard	Anduril
Edge Sensor Fusion	Hard
Fixed-Wing Flight Controller Software	Hard	Anduril
Checkpointing Multi-Day Training	Medium
Inference Batching, One GPU	Medium
Shadow Deployment & Canary Rollout	Medium
Python Dictionary to Store Data	Easy	Asana
Build a Recommendation System	Easy
Performers with MapReduce	Easy	Block
Recommendation Serving Under Cold-Start	Medium
GPU Cluster Scheduling	Hard
Model Registry & Rollback	Medium

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