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...
You should use IS NOT NULL. (The comparison operators = and <> both give UNKNOWN with NULL on either side of the expression.)
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...
Перевод отдельных слов, фраз, а также целых текстов и веб-страниц (английский, немецкий, французский, испанский, польский и др.).
...Concat((select+%28SELECT+concat%280X7E%2C0X27%2CUNHEX%28HEX%28CAST
Существуют специальные операторы IS NULL и IS NOT NULL, которые позволяют производить сравнения с NULLами.
NOT EXISTS and NOT IN with additional NULL checks perform better than LEFT JOIN / IS NULL.
Х.S. Использование UNION трех инструкций SELECT для демонстрации эффекта от использования скобок и ALLUsing UNION of three
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