Compute Each Advertiser's Share of Shop Ad Spend
Company: Meta
Role: Data Scientist
Category: Data Manipulation (SQL/Python)
Difficulty: medium
Interview Round: Onsite
Quick Answer: Practice a data science SQL interview problem that calculates each advertiser's seven-day Shop ad spend share after applying a total-spend threshold. The walkthrough covers conditional aggregation, HAVING filters, safe division, duplicate checks, and validation at the advertiser-ad-day grain.