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
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...
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
net - Does null == null? - Stack Overflow
So, I will never enter in if (x == null && y == null)? – serhio Nov 2 '10 at 12:08. point d is flat out NO, see comments. if they are pointing to a field on the object.
sql - Determine Oracle null == null - Stack Overflow
15 SELECT COUNT(*). 16 INTO v_b. 17 FROM batch. 18 WHERE equipment_id = R.equipment_id OR (equipment_id IS NULL AND R.equipment_id IS 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.
SQL Tip: COUNTing NULL values – Benjamin's Blog
sqlbenjamin.wordpress.com
I've been asked about counting NULL values several times so I'm going to blog about it in hopes others will be helped by this explanation of NULL values in
Команда IS NULL - проверка поля на NULL | Трепачёв Дмитрий
Команда IS NULL проверяет поле на NULL. Пример: SELECT * FROM workers WHERE salary IS NULL.
SQL NULL Values - IS NULL and IS NOT NULL
The IS NULL operator is used to test for empty values (NULL values). The following SQL lists all customers with a NULL value in the "Address" field
Обработка значений NULL - ADO.NET | Microsoft Docs
Разрешение значений NULL в определениях столбцов вводит в приложение логику трех значений.Allowing null values in column