Data Engineering

Learn essential data transformation techniques for cleaning, normalizing, and harmonizing data in ETL pipelines.

Understanding Medallion Architecture: A Comprehensive Guide In today’s data-driven world, organizations face the challenge of managing vast volumes of diverse data coming from multiple sources. The Medallion Architecture offers a structured way to tackle this challenge by organizing data into layered stages, gradually refining it from its raw form to a business-ready state. Often referred to as a multi-hop architecture, this pattern is especially popular in modern data lakehouse environments where the flexibility of a data lake meets the reliability of a data warehouse. ...

Introduction SQL Window Functions are powerful tools that allow you to perform calculations across a set of table rows related to the current row without collapsing the result into a single group. Unlike aggregate functions, which summarize data into a single row per group, window functions retain individual rows while applying calculations over a “window” of rows. This guide covers: Different types of window functions PARTITION BY and ORDER BY Real-world use cases What are Window Functions? A window function performs a calculation across a subset (window) of rows related to the current row. It uses the OVER() clause, which defines how the window is partitioned and ordered. ...