SQL

🚀 SQL

Welcome to this SQL Repo for data! This repository contains all the materials needed to master SQL, from the basics to advanced concepts.

📖 Introduction

SQL (Structured Query Language) is the standard language for interacting with relational databases. Mastering SQL opens the door to data analysis, backend development, and a plethora of other technology skills.

📚 Course Content

Introduction to SQL 🌐

• What is SQL? Why is it important?
• History and different dialects.
• Overview of common DBMS.

SQL Basics 📝

• Database structure: tables, rows, and columns.
• Common data types.
• Basic queries: SELECT, FROM, WHERE.
• Sorting results: ORDER BY.
• Filtering with WHERE.

Advanced Queries 🔍

• Joins: INNER JOIN, LEFT/RIGHT JOIN, FULL JOIN.
• Aggregation: COUNT, SUM, AVG, MIN, MAX.
• GROUP BY and HAVING.
• Subqueries and nested queries.

Data Manipulation 💽

• Insertion, updating, and deletion of data.
• Understanding transactions.

Database Creation and Management 🛠️

• Creating and modifying tables. CREATE DATABASE, CREATE TABLE.
• Introduction to constraints. PRIMARY KEY, FOREIGN KEY, UNIQUE, NOT NULL.
• ALTER TABLE: adding/removing columns, changing data types.
• DROP DATABASE, DROP TABLE.

SQL Functions

• String functions.
• Numeric functions.
• Date functions.

Indexes and Performance

• Introduction to indexes.
• Creating, modifying, and deleting indexes.
• Execution plan and query optimization.

Views, Stored Procedures, and Triggers

• Creating and using views.
• Introduction to stored procedures.
• Triggers and their uses.

🤝 Contribution

Feel free to open issues for any questions or suggestions. Pull Requests are also welcome if you want to improve the content or correct errors.