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TSQL - CONCAT_NULL_YIELDS_NULL ON Not Returning Null?
I understand that with CONCAT_NULL_YIELDS_NULL = ON means that the following will always resolve to NULL.
sql injection "union select null" - CodeProject
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...
sql - COUNT(*) Includes Null Values? - Stack Overflow
This includes NULL values and duplicates. How can you have a null value in a group?
Confusing SQL error in SELECT NULL, *, NULL, NULL - Stack Overflow
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
mysql - GROUP_CONCAT return NULL if any value... - Stack Overflow
SELECT a, GROUP_CONCAT(b) FROM gc GROUP BY a
sql - Counting null values as unique value - Stack Overflow
Hours 1 1 2 null null null. The result must be: 3. My query is: select count(distinct hour) from hours; but it returns: 2. I tested also
Нулевые указатели (null и nullptr) в C++ | Уроки С++ - Ravesli
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...
SQL ISNULL(), NVL(), IFNULL() and COALESCE() Functions
Suppose that the "UnitsOnOrder" column is optional, and may contain NULL values. Look at the following SELECT statement: SELECT ProductName, UnitPrice * (UnitsInStock + UnitsOnOrder) FROM Products; In the example above, if any of the "UnitsOnOrder" values are NULL, the result will be NULL.
Заметка про NULL / Хабр | select col from ttt where col is not null
Существуют специальные операторы IS NULL и IS NOT NULL, которые позволяют производить сравнения с NULLами.
Шпаргалка по SQL инъекциям | DefconRU
11223344) UNION SELECT NULL,NULL,NULL,NULL WHERE 1=2 –- Если нет ошибки, значит синтаксис верный, т.е. используется MS SQL Server.