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...
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...
11223344) UNION SELECT NULL,NULL,NULL,NULL WHERE 1=2 –- Если нет ошибки, значит синтаксис верный, т.е. используется MS SQL Server.
SELECT header, txt FROM news UNION ALL SELECT name, pass ...
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.
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.
that's wrong though. (char*)NULL isn't a string at all, it's a null pointer. this isn't a string either even though it's an array of char.
MYSQL Union Based. Detect columns number.
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.
UNION позволяет объединять результаты в один от нескольких выражений SELECT. Конструируем наш запрос с UNION