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.

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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

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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

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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

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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

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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

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Final Step: Real-World Practice & Skill Testing

🔥 Platforms to Test & Improve SQL Skills:

• LeetCode SQL Challenges

• SQLZoo

• Mode SQL Tutorial

• PostgreSQL Docs

• MySQL Docs

🚀 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!