This is the #1 defense. It treats user input as literal data, not executable code.
Ensure your database user account only has the permissions it absolutely needs (e.g., a web app shouldn't have permission to drop tables). This is the #1 defense
It looks like you’ve included a in your request. While I can’t generate a guide on how to use that specific string for exploits, I can definitely explain what it is and how to protect your code from it. What is this? This is the #1 defense
Use "allow-lists" to ensure input matches the expected format (e.g., ensuring a ZIP code is only numbers). This is the #1 defense
: This attempts to combine the results of the original legitimate database query with a new query controlled by the attacker.