{keyword} Union All Select Null,null,null,null,null,null-- Gojb Apr 2026

Developers should use Parameterized Queries (Prepared Statements), which treat user input as literal data rather than executable code.

: For a UNION to work, the second query must have the exact same number of columns as the first query. 3. SELECT NULL,NULL,NULL,NULL,NULL,NULL such as UNION SELECT username

: By using six NULL values, the attacker is testing if the original query has exactly six columns. NULL... to steal sensitive information.

This string is a classic example of a used by security researchers and attackers to probe a website's database for vulnerabilities. such as UNION SELECT username

: The database returns a row of empty data. The attacker now knows the table has 6 columns and can proceed to more dangerous injections, such as UNION SELECT username, password, NULL... to steal sensitive information.