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 ALL SELECT NULL, *, NULL, NULL FROM email. I understand what this does and why; the hacker needs to create a query that has the same number of columns as the query it's being merged with, and shifted around
...null, null, null, null from information_schema.tables. for a small database containing three tables. this
IS NULL вернёт истину, если операнд имеет значение NULL и ложь, если он им не является.
It should be noted that NULL pointer is different from an uninitialized and dangling pointer. In a specific program context, all uninitialized or dangling or NULL pointers are invalid but
Note: A NULL value is different from a zero value or a field that contains spaces. A field with a NULL value is one that has been left blank during record creation!
null null null null — Toster.ru | «Тостер» — вопросы и ответы.
NULL в Системах управления базами данных (СУБД) — специальное значение (псевдозначение), которое может быть записано в поле таблицы базы данных (БД). NULL соответствует понятию «пустое поле», то есть «поле, не содержащее никакого значения».
I do consider assignment statements and pointer variables to be among computer science's "most valuable treasures.". Donald Knuth, Structured Programming, with go to Statements.
Значение NULL в реляционной базе данных используется, если значение в столбце неизвестно или отсутствует.A null value in a relational database is