SQL stands for Structured Query Language. It is the standard language used to communicate with databases. Think of a database as a digital storage system where information is organized into tables. Few are some of the examples that SQL can helps us with: Retrieve data Insert new data Update existing data Delete unwanted data Analyze information Database: A database is an organized collection of data stored electronically. Instead of keeping data in spreadsheets or paper files

Introduction Have you ever wondered what are null values in data? Honestly, before diving deep, I assumed they were equal to zero, if I encountered them in numeric columns and if in text columns, simply nothing. As a result, I ended up with mismatched numbers, wrong visualizations. My worst nightmare! I got baffled, but I was sure that this must do something with these null values and I decided to learn more about them and their behavior so I can be confident that the