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📘 Day 107: SQL Security

Welcome to Day 107! Today, we'll discuss SQL Security, a critical topic for protecting your database from unauthorized access and malicious attacks.

Key Security Concepts

Authentication

Authentication is the process of verifying the identity of a user. In SQL databases, this is typically done with a username and password.

Authorization

Authorization is the process of granting or denying access to a user based on their identity. This is managed through user permissions and roles.

GRANT and REVOKE

  • GRANT: The GRANT command is used to give a user permissions to perform certain operations (e.g., SELECT, INSERT, UPDATE, DELETE) on database objects.
  • REVOKE: The REVOKE command is used to take away permissions from a user.

SQL Injection

SQL Injection is a code injection technique that might destroy your database. SQL Injection is one of the most common web hacking techniques. It is the placement of malicious code in SQL statements, via web page input.

How to Prevent SQL Injection

  • Use Prepared Statements (with Parameterized Queries): This is the most effective way to prevent SQL injection. The SQL statement is sent to the database separately from the parameters.
  • Escape User Input: Sanitize user input by escaping characters that have a special meaning in SQL.

💻 Exercises: Day 107

The exercises for today are conceptual. Please review the README.md file and make sure you understand the following concepts:

  • Authentication vs. Authorization.
  • How GRANT and REVOKE are used to manage permissions.
  • What SQL Injection is and how to prevent it.

Previous: Day 106 – Day 106: XML in SQL • Next: Day 108 – Day 108: SQL Performance Tuning

You are on lesson 107 of 108.