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...
11223344) UNION SELECT NULL,NULL,NULL,NULL WHERE 1=2 –- Если нет ошибки, значит синтаксис верный, т.е. используется MS SQL
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...
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
...NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,CONCAT%28version(),0x3a,user
Существуют специальные операторы IS NULL и IS NOT NULL, которые позволяют производить сравнения с NULLами.
Пример: SELECT * FROM workers WHERE salary IS NOT NULL.
In this table I need to select only the ids which have both null and not null marks, and it should not be both not null or both are null in col1.
It crashes immediately... NSInvalidArgumentException -[_NSInlineData isEqualToString:]: unrecognized selector sent to instance 0x60802d051c10 ( 0 CoreFoundation 0x00007fff921d0e7b __exceptionPreprocess + 171 1 libobjc.A.dylib 0x00007fffa...
Разрешение значений NULL в определениях столбцов вводит в приложение логику трех