SQL for Beginners

SQL (Structured Query Language) is the standard language for dealing with Relational Databases. From banking to social media, SQL is at the heart of data management.

4. Data Retrieval (SELECT)

The SELECT statement is used to retrieve data from a database table.

-- Retrieve all students
SELECT * FROM students;

-- Retrieve specific columns
SELECT name, age FROM students;

5. Filtering Data (WHERE)

The WHERE clause allows you to search for records that meet specific criteria.

SELECT * FROM students 
WHERE score > 85;

SELECT * FROM users 
WHERE city = 'Bangalore';

10. Table Relationships (JOINS)

Joins connect related data across multiple tables.

SELECT orders.id, customers.name
FROM orders
INNER JOIN customers 
ON orders.user_id = customers.id;