SQL (PostgreSQL, MySQL)

SQL (PostgreSQL & MySQL) Mastery Roadmap

This detailed roadmap will take you from beginner to expert in SQL, covering database design, querying, indexing, optimization, security, and real-world projects using PostgreSQL & MySQL.

Phase 1: SQL Fundamentals

✅ Introduction to SQL

  • What is SQL? Why is it essential?

  • Differences between PostgreSQL & MySQL

  • Setting up PostgreSQL & MySQL on your system

✅ Basic SQL Queries

  • Selecting data (SELECT, FROM, WHERE)

  • Filtering data (AND, OR, LIKE, IN, BETWEEN)

  • Sorting (ORDER BY), Limiting (LIMIT, OFFSET)

  • Aggregate functions (COUNT, SUM, AVG, MIN, MAX)

📌 Mini Projects:

  • Employee Database Query System

  • Product Inventory Report

Phase 2: Database Design & Relationships

✅ Database Schema Design

  • Tables, Columns, and Data Types (INTEGER, VARCHAR, TEXT, DATE, BOOLEAN)

  • Primary Keys, Foreign Keys, Unique Constraints

✅ Normalization & Relationships

  • 1NF, 2NF, 3NF, BCNF

  • One-to-One, One-to-Many, Many-to-Many Relationships

  • Creating relations using JOIN (INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL JOIN)

📌 Mini Projects:

  • Design a Student Management System Database

  • E-commerce Database Schema

Phase 3: Advanced Querying & Indexing

✅ Advanced SQL Queries

  • Subqueries & Common Table Expressions (CTEs)

  • Views & Materialized Views

  • Stored Procedures & Functions

  • Triggers & Events

✅ Indexing & Query Optimization

  • Types of Indexes: B-Tree, Hash, Partial, Composite Indexes

  • EXPLAIN & ANALYZE queries for performance tuning

  • Partitioning & Sharding

📌 Mini Projects:

  • Optimize Slow Queries in a Large Dataset

  • Implement Indexing in a Blogging Platform

Phase 4: Transactions, Security & Best Practices

✅ Transactions & Concurrency Control

  • ACID Principles

  • Transaction Isolation Levels (READ COMMITTED, SERIALIZABLE, etc.)

  • Locks & Deadlocks Prevention

✅ Security & Best Practices

  • Role-Based Access Control (RBAC)

  • SQL Injection Prevention

  • Data Encryption & Backups

📌 Mini Projects:

  • Secure a User Authentication System (RBAC + Encryption)

  • Database Backup & Restoration Automation

Phase 5: Real-World Applications & Projects

✅ Using SQL with Programming Languages

  • Node.js (pg for PostgreSQL, mysql2 for MySQL)

  • Python (psycopg2, SQLAlchemy, MySQL Connector)

✅ Final Projects & Portfolio Building

  • Building a Social Media Database

  • Developing a Banking System Database

  • Creating a Log Analysis System

Final Step: Real-World Practice & Skill Testing

🔥 Platforms to Test & Improve SQL Skills:

🚀 By mastering this roadmap, you’ll be able to: ✅ Design efficient and scalable databases ✅ Write optimized, secure SQL queries ✅ Manage transactions, indexes, and database security ✅ Integrate SQL databases with applications

🔥 Start mastering SQL now!

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