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c - What is the difference between NULL, '\0' and 0 - Stack Overflow


In C, there appear to be differences between various values of zero -- NULL, NUL and 0. I know that the ASCII character '0' evaluates to 48 or 0x30. The NULL pointer is usually defined as: … Or …



Note: A NULL value is different from a zero value or a field that contains spaces.

sql - WHERE all IS NOT NULL - Stack Overflow | Post as a guest


How can I run a MySQL query that selects everything that is not null? It would be something like … Do I just remove the all and go..?

Understanding the difference between null and '\u000' in Java


I read in a book (Thinking in Java by Bruce Eckel, 4th edition, page 47) that null is equal to '\u000'. And then I was wondering what exactly does '\u000' really mean.

Replacing NULL with 0 in a SQL server query - Stack Overflow


I have developed a query, and in the results for the first three columns I get NULL. How can I replace it with 0?

mysql - Site has been hacked via SQL Injection - Stack Overflow


0x31303235343830303536 is NULL - they are just matching the number of columns in your existing query. If you had SELECT * FROM users and users had 4 columns, the UNION must also have 4

SQL Injection Cheat Sheet | Netsparker


11223344) UNION SELECT NULL,NULL,NULL,NULL WHERE 1=2 –- No Error - Syntax is right. MS SQL Server Used. Proceeding.

sql - Not equal <> != operator on NULL - Stack Overflow


Could someone please explain the following behavior in SQL?

Заметка про NULL / Хабр


Даже выражение NULL != NULL не будет истинным, ведь нельзя однозначно сравнить одну неизвестность с другой. Кстати, ложным это выражение тоже не будет, потому что при вычислении условий Oracle не ограничивается состояниями ИСТИНА и ЛОЖЬ.

NULL (SQL) — Википедия


NULL в Системах управления базами данных (СУБД) — специальное значение (псевдозначение), которое может быть записано в поле таблицы базы данных (БД). NULL соответствует понятию «пустое поле», то есть «поле, не содержащее никакого значения».

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