{keyword}' Union All Select Null,null,null,null,null,null,null,null-- Jynz 〈No Login〉

The payload you provided, ' UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL-- , is a common pattern used in to determine the number of columns returned by an original database query. What this Payload Does

If the original query has 8 columns, the page will likely load normally or show an extra row of empty data. The payload you provided, ' UNION ALL SELECT

: Appends a new set of results to the original query's output. The payload you provided

: Attempts to select 8 columns of "null" data. ' UNION ALL SELECT NULL

NULL is used because it is compatible with almost any data type (string, integer, date, etc.), ensuring the query won't fail due to data type mismatches.