Which of the following is not a common technique used to prevent SQL injection attacks? Input validation Output encoding Prepared statements Session hijacking

Session hijacking is not a common technique used to prevent SQL injection attacks.

Here's why:

1. Input Validation: This is a method where you check and validate the data entered by the user to ensure it's safe and correct. This can prevent SQL injection attacks by ensuring that harmful or malicious code isn't being entered.

2. Output Encoding: This is a technique where you encode the output data to ensure it's safe to be displayed on the screen. This can prevent SQL injection attacks by ensuring that any harmful or malicious code that might have been entered is rendered harmless.

3. Prepared Statements: These are SQL statements that are sent to and parsed by the database server separately from any parameters. This can prevent SQL injection attacks because it ensures that an attacker can't change the intent of a query, even if they insert malicious code.

4. Session Hijacking: This is a method where an attacker takes over a user's session to gain unauthorized access to their data. This is not a technique used to prevent SQL injection attacks, but rather, it's a type of attack itself.