Learn SQL with Real Code Examples

Understand relational data modeling

Learn basic CRUD operations

Master joins, subqueries, and aggregation

Study indexing, constraints, and transactions

Practice database optimization and analytics queries

Week 1: Basic SELECT, INSERT, UPDATE, DELETE

Week 2: Joins, GROUP BY, and aggregate functions

Week 3: Subqueries, CTEs, and window functions

Week 4: Transactions, constraints, and indexing

Week 5: Performance tuning and backup strategies

What is SQL and why is it important?

Explain the difference between INNER JOIN, LEFT JOIN, and RIGHT JOIN.

How do transactions ensure data consistency?

What are indexes and how do they improve performance?

Explain normalization and denormalization in databases.

SELECT * FROM table WHERE condition - basic query

INSERT INTO table (columns) VALUES (values) - add data

UPDATE table SET column=value WHERE condition - modify data

DELETE FROM table WHERE condition - remove data

CREATE TABLE table_name (columns) - define schema

SQL in 10 Minutes, Sams Teach Yourself

Learning SQL by Alan Beaulieu

SQL Cookbook by Anthony Molinaro

Pro SQL Server Internals

High Performance MySQL

SQL basics: SELECT, INSERT, UPDATE, DELETE

Joins and subqueries

Aggregate functions and GROUP BY

Transactions and constraints

Advanced querying with window functions

https://www.iso.org/standard/63555.html (SQL standard)

MySQL Documentation

PostgreSQL Documentation

Oracle SQL Reference

SQL Server Docs

StackOverflow SQL tag

Database-specific forums (MySQL, PostgreSQL, Oracle)

Reddit r/SQL

Official documentation and GitHub repositories

Tutorial blogs and courses

RDBMS-specific forums and StackOverflow

Official documentation (MySQL, PostgreSQL, Oracle, SQL Server)

Community tutorials and blogs

Open-source RDBMS GitHub repositories

Database conferences and webinars