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Hello Rana, the default query is "SELECT banner FROM v$version" but in the payload you put a comma (,) after banner (UNION select banner, NULL from v$version). I don't understand this one. It would be of great help if you can kindly explain little bit more about the payload.
Because in the original query there are two columns so the Null represent the second column since as we only need banner in the first column and we can't leave the second column empty we put Null so if it were 3 columns we put UNION SELECT banner,Null,Null FROM v$version