sql

How Indexes Speed Up SQL Queries (Explained Like You’re 5) Let’s make this super chill and easy to understand. No […]

Want your queries to go from slow 🚶‍♂️ to fast 🚀? Indexes are your secret weapon. What Is an Index

These 4 rules keep your data safe — no half-finished updates, no broken values, and no weird side effects. What

When you want your database changes to be safe, reversible, and controlled, you use a transaction. Imagine This Table: accounts

SQL isn’t just about storing data — it’s also about making sure that data follows the rules. That’s where CHECK

SQL constraints help you control your data, just like rules in a game. Two of the most common ones are

🔗 FOREIGN KEY – Connecting Tables Like a Pro Because real databases don’t live in isolation. Quick Syntax to Create

PRIMARY KEY – Unique + Not NULL Because every row in your table deserves to be one of a kind.

EXCEPT / MINUS – Show Me What’s in One, But Not the Other (because sometimes, you want to know who

INTERSECT – Get What’s Common Between Two Queries (because sometimes, you only want the stuff that shows up in both