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...
I have developed a query, and in the results for the first three columns I get NULL. How can I replace it with 0?
Используйте NULL в UNION-инъекциях вместо попыток угадать строку, дату, число и прочее. Но будьте аккуратны при слепой инъекции, т.к. вы можете спутать ошибку БД и самого приложения. Некоторые языки, например ASP.NET, выдают ошибку при использовании значения NULL (т.к...
As a result, they just used `NULL values to populate those columns. the real confusion is in the
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...
11223344) UNION SELECT NULL,NULL,NULL,NULL WHERE 1=2 –- No Error - Syntax is right. MS SQL Server Used.
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
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».
A SELECT statement returns several rows: … I get 47 rows that have 'NULL' for ColA within TableA. … If I add an aggregate to this query: … I get … Why is this happening, and what can I do to avoid this?
AND(SELECT COUNT(*) FROM (SELECT 1 UNION SELECT null UNION SELECT !1)x GROUP BY CONCAT((SELECT table_name FROM information_schema.tables LIMIT 1),FLOOR(RAND(0)*2))).