Understanding Slowly Changing Dimensions (SCD) — The Ultimate Guide for Data Engineers
Introduction: What Are Slowly Changing Dimensions and Why Do They Matter? In the world of data engineering and analytics, Slowly […]
Data Loading & Data Modeling in ETL
Data loading is one of the most important stages of any ETL (Extract, Transform, Load) pipeline. Once data is extracted […]
Data Transformation Fundamentals — A Complete Guide for Modern ETL Pipelines
Introduction Data transformation is one of the most essential stages of any ETL pipeline. While extraction brings data into the […]
Advanced JOINs – Self Joins, Multiple Joins, and Anti/Semi Joins
Welcome back! 👋In the last lesson, we learned the basics of JOINs: In this lesson, we’ll explore more advanced JOIN techniques used […]
How to Get Started with Data Ingestion in ETL — A Beginner’s Guide
Data ingestion is the first and most critical stage of any ETL (Extract, Transform, Load) pipeline. It is the process […]
What Is ETL? A Complete Beginner’s Guide to Extract, Transform, Load
In today’s data-driven world, organizations generate massive volumes of information every second—customer transactions, website interactions, sensor readings, operational logs, and […]
Sorting, Grouping, and Aggregating Data in SQL
Welcome back! 👋So far, we’ve learned how to: In this lesson, we’ll take it further by learning how to organize and […]
Filtering Data – Advanced WHERE, IN, BETWEEN, LIKE, and NULL
Welcome back! 👋In the last lesson, we learned how to retrieve data using SELECT, filter with WHERE, sort with ORDER BY, and use […]
Basic SQL Queries – SELECT, Filtering, and Sorting
Welcome back! 👋Now that we have our database and tables set up with proper data types and constraints, it’s time to learn the most important SQL commands — how […]
Understanding SQL Data Types & Table Constraints
Welcome back! 👋In the last lesson, we created our first database and tables. In this lesson, we’ll dive deeper into data types and constraints, which are […]