-1469 Union | All Select 34,34#

If a website isn't "sanitizing" user input, an attacker can use these tricks to:

Are you looking to write a on how to prevent these attacks, or more of a beginner's overview of web security? -1469 UNION ALL SELECT 34,34#

: The attacker is trying to match the number of columns in the original query. If the page loads "34," they know the table has two columns and they can start pulling real data (like usernames or passwords) in those slots. If a website isn't "sanitizing" user input, an

: This is a dummy value. By using a negative or non-existent ID, the attacker ensures the first part of the query returns no results, making room for the injected data to show up. : This is a dummy value

The best way to prevent this is to use (parameterized queries). This ensures the database treats the input as literal text, not as a command to be executed.

It looks like you're testing for vulnerabilities! That specific string— -1469 UNION ALL SELECT 34,34# —is a classic example of a payload used to bypass security or leak data from a database.