Learn SQL
Master database design, CRUD operations, joins, subqueries, indexing, normalization, and interview preparation from beginner to advanced level.
Why Learn SQL?
SQL (Structured Query Language) is the standard language used to manage and query relational databases. It's an essential skill for software developers, data analysts, data scientists, and database administrators.
Course Modules
A structured path to mastering SQL.
Module 1: Introduction
- What is SQL?
- DBMS vs RDBMS
- Types of databases
- MySQL / PostgreSQL
- Real-world usage
Module 2: Basic Syntax
- SQL structure
- Commands overview
- Comments
- Case sensitivity
Module 3: Tables & DB
- CREATE DATABASE
- CREATE TABLE
- DROP & ALTER TABLE
- Data types
Module 4: CRUD
- INSERT INTO
- SELECT
- UPDATE
- DELETE
Module 5: SELECT
- WHERE clause
- ORDER BY
- DISTINCT
- LIMIT & Aliases
Module 6: Filtering
- AND / OR / NOT
- BETWEEN & IN
- LIKE operator
- NULL checks
Module 7: Aggregation
- COUNT() & SUM()
- AVG() & MIN / MAX
- GROUP BY
Module 8: Joins
- INNER JOIN
- LEFT & RIGHT JOIN
- FULL JOIN
- SELF JOIN
Module 9: Subqueries
- Simple subqueries
- Nested subqueries
- Correlated subqueries
Module 10: Constraints
- PRIMARY KEY
- FOREIGN KEY
- UNIQUE & NOT NULL
- CHECK
Module 11: Relationships
- One-to-One
- One-to-Many
- Many-to-Many
- ER diagrams
Module 12: Advanced
- CASE statement
- UNION
- EXISTS
- ANY / ALL
Module 13: Indexing
- What is indexing?
- Clustered index
- Non-clustered index
- Performance tuning
Module 14: Views
- Creating views
- Updating views
- Dropping views
- Benefits
Module 15: Security
- Users & roles
- GRANT
- REVOKE
- Privileges
Module 16: Procedures
- Stored Procedures
- Functions
- IN / OUT parameters
Module 17: Triggers
- BEFORE trigger
- AFTER trigger
- INSERT / UPDATE / DELETE
Module 18: Transactions
- COMMIT & ROLLBACK
- SAVEPOINT
- ACID properties
Module 19: Normalization
- 1NF, 2NF, 3NF
- Data redundancy
Module 20: SQL + Code
- SQL with Python
- SQL with Java (JDBC)
- Connectors
Module 21: Projects
- Student system
- Bank system
- E-commerce DB
- Library system
Module 22: Optimization
- Query optimization
- Execution plans
- Index tuning
Module 23: Interviews
- SQL questions
- Joins practice
- Subquery problems
- Real scenarios
Frequently Asked Questions
Common questions about learning SQL.
What is SQL?
SQL is a language used to manage and query relational databases.
Is SQL easy to learn?
Yes, SQL is highly beginner-friendly and reads similarly to plain English, making it relatively fast to pick up with practice.
Which databases use SQL?
MySQL, PostgreSQL, SQL Server, Oracle Database, and SQLite all use SQL variations.
Can I get a job by learning SQL?
SQL is one of the most in-demand skills for software developers, data analysts, and database professionals across the globe.