{keyword}' Union All Select Null,null,null,null,null,null,null,null,null,null-- Ebfu Online

: Comments out the rest of the legitimate SQL code so it doesn't execute and cause an error.

: Used to match the number of columns in the original table. Attackers add these one by one until the error message disappears. : Comments out the rest of the legitimate

It looks like you’ve included a in your request. If you are interested in how these vulnerabilities work and how to prevent them, 🛠️ Breakdown of the Injection : Comments out the rest of the legitimate

: Combines the results of the original query with a new query. : Comments out the rest of the legitimate

Point you toward (like OWASP) to practice security testing.