: This command attempts to combine the results of the original query with a new "dummy" row.
: This is a comment symbol that tells the database to ignore the rest of the original, legitimate query. How to Protect Your Application : This command attempts to combine the results
It looks like you've provided a string commonly used in testing or attacks. This specific syntax is used to probe a database's structure and extract data by appending an extra set of results to a legitimate query. Breakdown of the SQL String : This command attempts to combine the results