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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...
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...
' UNION SELECT NULL-- ' UNION SELECT NULL,NULL-- ' UNION SELECT NULL,NULL,NULL-- etc. If the number of nulls does not match the number of columns, the database returns an error, such as: All queries combined using a UNION, INTERSECT or EXCEPT operator must have an equal number...
select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null,null,e,f from table3.
The UNION operator selects only distinct values by default. To allow duplicate values, use UNION ALL
second row have null values in 11,22,24 columns.....etc for all the other 600 rows. I need to select the data which do not have null values.
--Запрос №3 select * from dual where null=null. Очевидно, что запрос №3 не вернет ни одной строки, соответственно, запрос №1 также не вернет ни
[text] [varchar](50) NULL, CONSTRAINT [PK_test_table_2] PRIMARY KEY CLUSTERED (.
Предикат IS NULL позволяет проверить отсутствие (наличие) значения в полях таблицы. Использование в этих случаях обычных предикатов сравнения может привести к неверным результатам, так как сравнение со значением NULL дает результат UNKNOWN (неизвестно).
In general, every NULL value is taken into account to vary from each alternative NULL in the database.