{keyword}') Union All Select — Null,null,null,null,null,null,null,null,null-- Zljd

To protect an application from this specific type of attack, developers should follow these industry-standard practices:

: Only allow expected characters (e.g., alphanumeric only for a username). To protect an application from this specific type

: The user-provided input. The ' and ) are used to close the developer’s original SQL statement (e.g., SELECT * FROM products WHERE name = ('$KEYWORD') ). To protect an application from this specific type

: These are placeholders. For a UNION attack to work, the second query must have the exact same number of columns as the first. Attackers use NULL to test and match the column count without causing data type errors. To protect an application from this specific type