SELECT CAST (miles AS INT) FROM Flights -- convert timestamps to text INSERT INTO mytable (text_column) VALUES ... Now you can chat with who search for : 999999.9 uNiOn aLl sElEcT cAsT 0x393133353134353632312e39 as char.
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...
so that both comparisons: x = NULL and x <> NULL evaluates to NULL(unknown). SQL implements three logical results, so SQL implementations must provide for a specialized three-valued logic (3VL).
qndbq15bbxilyCzFA') UNION ALL SELECT NULL,NULL,NULL,CONCAT(0x716e646271,IFNULL(CAST(table_name AS CHAR),0x20),0x716a716771),NULL FROM INFORMATION_SCHEMA.TABLES WHERE...
It's important to note, that NULL doesn't equal NULL. NULL is not a value, and therefore cannot be compared to another value. where x is null checks
SQL supports NULL, a special value that is employed to represent the values of attributes that will be unknown or not apply to a tuple.
i am trying to do union i get data with null values and i want do not want it to show in result.
The null character (also null terminator or null byte) is a control character with the value zero. It is present in many character sets, including ISO/IEC 646 (or ASCII), the C0 control code, the Universal Coded Character Set (or Unicode), and EBCDIC.
Оператор объединения с NULL ?? возвращает значение своего операнда слева, если его значение не равно null.
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».