: This command instructs the database to combine the results of the original query with a new, attacker-defined query.

The string "-1262' UNION ALL SELECT 34,34,34,34,34#" is a classic example of a . It is designed to probe a database for vulnerabilities by attempting to append unauthorized data to the results of a legitimate query. Payload Breakdown

: This part attempts to break the original SQL statement. The leading - and a likely non-existent ID (like -1262) ensure the original query returns no results, making the injected data easier to see. The single quote ( ' ) is used to "close" the intended input field.

The attacker can now proceed to Retrieve Database Information such as table names, user credentials, or configuration details.

: In many SQL dialects (like MySQL), this symbol acts as a comment . It tells the database to ignore the rest of the original, legitimate query that follows the injection point, preventing syntax errors that would tip off security systems. Why This is Significant

: These are "dummy" values. Attackers use these to determine the exact number of columns the original query is expecting. If the application displays the number 34 on the page, the attacker knows which columns are visible and can later replace those numbers with commands to extract sensitive data like passwords or emails.