Select c.rundate, sum(case when c.runstatus = 'Succeeded' then 1 end) as Succeeded, sum(case when c.runstatus = 'Failed' then 1 end) as Failed, sum(case when
1' UNION SELECT @--+ #The used SELECT statements have a different number of columns 1' UNION SELECT
null is nothing but internal Pointer with value zero. So it is comparing two references having value zero. In fact object.ReferenceEquals(null, null) is always true because of this fact so you do not need the second check.
If c is not NULL, why c doesn't be printed out as an adress something like "0x401dee".
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...
If a null pointer constant is converted to a pointer type, the resulting pointer, called a null pointer, is guaranteed to compare unequal to a pointer to any object or function.”
Null pointers were also all-bits-zero; if you accidentally wrote to a null pointer then you blasted over the OS settings that were at the zero address; hilarity usually
Как и в случае с обычными переменными, указатели не инициализируются при создании. Если значение не было присвоено, то указатель по умолчанию будет указывать на любой адрес, содержимым которого...
Possible Duplicate: Do you use NULL or 0 (zero) for pointers in C++? Is it a good idea to use NULL in C++ or
Добрый день! Подскажите, пожалуйста, что значит "NULL", и когда он применяется ? В примере ниже , насколько я понимаю, создаётся строка, и в этой строке нет