Welcome to the SQL Reference Guide! This section provides comprehensive information about the SQL (Structured Query Language) syntax, features, and usage. Whether you are a beginner or an experienced user, this guide will help you understand and utilize SQL effectively.

Common SQL Commands

Here are some of the most commonly used SQL commands:

  • SELECT: Retrieve data from a database.
  • INSERT: Add new records to a database.
  • UPDATE: Modify existing records in a database.
  • DELETE: Remove records from a database.
  • CREATE: Create a new database or table.
  • DROP: Delete a database or table.

Examples

SELECT

SELECT * FROM customers;

This command retrieves all records from the "customers" table.

INSERT

INSERT INTO customers (name, email) VALUES ('John Doe', 'john.doe@example.com');

This command adds a new record to the "customers" table with the name "John Doe" and email "john.doe@example.com".

UPDATE

UPDATE customers SET email = 'john.doe@newdomain.com' WHERE name = 'John Doe';

This command updates the email address of the customer named "John Doe" to "john.doe@newdomain.com".

DELETE

DELETE FROM customers WHERE name = 'John Doe';

This command deletes the record of the customer named "John Doe" from the "customers" table.

Learn More

For more detailed information, please visit our SQL Tutorial.

SQL Query Example