Union select null, null, null, null, null, null, null from information_schema.tables. for a small
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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...
...NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,CONCAT%28version(),0x3a,user
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UNION ALL SELECT NULL, *, NULL, NULL FROM email. I understand what this does and why; the hacker needs to create a query that has the same number
Существуют специальные операторы IS NULL и IS NOT NULL, которые позволяют производить сравнения с NULLами.
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`name` varchar(255) NOT NULL DEFAULT NULL, This spills a error that would roughly translate to (Default value invalid for name). I tried on a different mysql installation 5.1.73-1 (Debian) and I have the same behavior.
A field with a NULL value is one that has been left blank during record creation! How to Test for NULL Values?