{keyword}' Union All Select Null-- Xiuj -

Selects NULL values to match the number of columns in the original query. NULL is used because it is compatible with almost all data types.

The query ' UNION ALL SELECT NULL-- is a classic payload used in attacks to determine the structure of a database query. It is used when an application is vulnerable to SQL injection and returns query results directly in its HTTP responses. {KEYWORD}' UNION ALL SELECT NULL-- xIuj

Comments out the rest of the original SQL query, preventing syntax errors caused by the remaining code. Purpose and Techniques SQL injection UNION attacks | Web Security Academy Selects NULL values to match the number of

Combines the results of the original, intended query with the results of a new, malicious query. It is used when an application is vulnerable

Closes the original input string, allowing the attacker to break out of the intended query structure.