Udemy - Data Warehouse - — The Ultimate Guide

Every Monday morning, the CEO would ask the same question: "Show me the lifetime value of a customer who buys a blue sweater after seeing a TikTok ad."

The most painful lesson came from "Type 2 Slowly Changing Dimensions." Previously, if a customer moved from "California" to "Texas," the old data would overwrite the new, erasing history. Lena taught him how to track history. Now, Arjun could see when a customer moved and if their buying behavior changed because of it. The CEO’s blue-sweater-TikTok question was no longer impossible; it was just a simple join. udemy - data warehouse - the ultimate guide

The CFO whispered, "That… that used to take three days." Every Monday morning, the CEO would ask the