user=-5305' UNION ALL SELECT NULL, CONCAT... - Pastebin.com
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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.
hitman 2 silent assassin--tor--random-agent--level=5--risk=3--tamper...
...UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL,NULL,CONCAT(0x717a6a7171
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they recognize it as a noun and all three of them (Google, Yahoo, and Babel)...
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sql injection "union select null" - CodeProject | To display as
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...
Функции CAST и CONVERT (Transact-SQL) - SQL... | Microsoft Docs
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Note: A NULL value is different from a zero value or a field that contains spaces.