security - Sql injection can someone explain this code... - Stack Overflow
So, as it's being used a lot, I would submit my answer. In my opinion, the aim of these requests is to check the presence or absence of a sql injection.
Функции CAST и CONVERT (Transact-SQL) - SQL... | Microsoft Docs
SELECT 'The list price is ' + CAST(ListPrice AS varchar(12)) AS ListPrice FROM dbo.DimProduct WHERE ListPrice BETWEEN 350.00 AND 400.00
999999.9 uNiOn aLl sElEcT cAsT 0x393133353134353632312e39 as...
Please Don't Close This Page Before Help Others For True Answer Without Any Register And Fast And Easy.
sql - MySQL: Typecasting NULL to 0 - Stack Overflow
select a.id, t1.column_1, t2.column_2, (t1.column_1 + t2.column_2) as cumulated from a left join
Шпаргалка по SQL инъекциям | DefconRU
Используйте NULL в UNION-инъекциях вместо попыток угадать строку, дату, число и прочее. Но будьте аккуратны при слепой инъекции, т.к. вы
999999.9 union all select...
999999.9 union all select cast0x393133353134353632312e39 as char and 0=0.
php - A customers site had a big mysql injection attack on it, just want...
union all select null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null
Null character - Wikipedia
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.
MySQL CONCAT() Function
SELECT CONCAT("SQL ", "Tutorial ", "is ", "fun!") AS ConcatenatedString; Try it Yourself ». Definition and Usage. The CONCAT() function adds two or more expressions together. Note: Also look at the CONCAT_WS() function.
NULL (SQL) — Википедия
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».