SQL From Basic to Advance Complete Guide

Complete SQL Guide: From Basics to Advanced (Including Window Functions)

I’m excited to share a concise yet comprehensive SQL Guide that covers everything from fundamental queries to advanced analytical concepts. This guide is designed to help students, aspiring data analysts, and professionals strengthen their SQL foundation and confidently work with real-world datasets.

🔹 What this guide covers:

* Core SQL commands: SELECT, WHERE, ORDER BY, DISTINCT

* Data manipulation: INSERT, UPDATE, DELETE

* Table operations: CREATE, DROP, TRUNCATE

* Aggregations & filtering: GROUP BY, HAVING, aggregate functions

* Joins & subqueries for relational data analysis

* Conditional logic using CASE

* Performance essentials: INDEX, VIEWS, STORED PROCEDURES

* Advanced analytics with Window Functions:

ROW_NUMBER(), RANK(), DENSE_RANK(), LAG(), LEAD(), PARTITION BY

💡 Whether you’re preparing for interviews, improving your data analysis skills, or revising SQL concepts end-to-end, this guide can serve as a quick reference and learning companion.

📌 Learning SQL isn’t just about writing queries—it’s about extracting insights and making data-driven decisions.