...UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL,NULL,CONCAT(0x717a6a7171
Union select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables. this instruction is used in sql injection I tried it and it worked but I didn't really know how it works can somebody help me...
select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null,null,e,f from table3.
As a result, they just used `NULL values to populate those columns. the real confusion is in the CONCAT(). They are combining 126, 39, database name as hex
Type: UNION query Title: Generic UNION query (NULL) - 4 columns Payload: id=-4130 UNION ALL SELECT NULL,NULL,CONCAT(0x71627a7071
Именно так и никак иначе: null в C# — однозначно ошибочное решение, бездумно скопированное из более ранних языков.
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union all select null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null
Удаление Null: Удалите Null Навсегда. Что такое Null. Скачать утилиту для удаления Null. Удалить Null вручную.