: 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.
The attacker can now proceed to Retrieve Database Information such as table names, user credentials, or configuration details. -1262' UNION ALL SELECT 34,34,34,34,34#
: This command instructs the database to combine the results of the original query with a new, attacker-defined query. : These are "dummy" values
: 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
This specific payload is a "fingerprinting" or "reconnaissance" step. If a website responds by showing the number 34 five times, it confirms that: The site is . The database query uses five columns .