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...
1' UNION SELECT 1,2,3--+ True. Using LIMIT INTO Error Based. This method works if error showing is enabled. It is useful for finding the number of columns when the injection point is after a LIMIT clause.
It should be noted that NULL pointer is different from an uninitialized and dangling pointer. In a specific program context, all uninitialized
http://www.itamed.com/mcms/itamedt/content.cfm?pulldata=scmsmembers.cfm&function=members&perform=memberappita&entity_id=11+limit+0+UNION+SELECT+1,2,concat_ws(0x3a,user(),version
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 of columns as the query it's being merged with, and shifted around the * to make sure the emails are displayed. That's not my question.
SELECT * FROM schedule WHERE ((all)) IS NOT NULL. Do I just remove the all and go..?
Перевод отдельных слов, фраз, а также целых текстов и веб-страниц (английский, немецкий, французский, испанский, польский и др.).
Null values and null pointers. Just like normal variables, pointers are not initialized when they are instantiated. Unless a value is assigned, a pointer
Добрый день! Подскажите, пожалуйста, что значит "NULL", и когда он применяется ? В примере ниже , насколько я понимаю, создаётся строка, и в этой строке нет
Существуют специальные операторы IS NULL и IS NOT NULL, которые позволяют производить сравнения с NULLами.