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SQL NULL Values - IS NULL and IS NOT NULL
Note: A NULL value is different from a zero value or a field that contains spaces. A field with a NULL value is one that has been left blank during record creation!
SQL is null and = null - Stack Overflow
What is the difference between … and … and why does the latter not work?
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.
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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».
Modern SQL: NULL — purpose, comparisons, NULL in expressions...
SQL’s NULL indicates absent data. NULL propagates through expressions and needs distinct comparison operators.
значения SQL NULL - IS NULL и IS NOT NULL
значения SQL NULL. Если столбец в таблице не является обязательным, то мы можем вставлять новые записи или обновить существующие записи без добавления значения в столбце.
Заметка про NULL / Хабр
Специальное значение NULL означает отсутствие данных, констатацию того факта, что значение неизвестно. По умолчанию это значение могут принимать столбцы и переменные любых типов, если только на них не наложено ограничение NOT NULL.
SQL NULL Values - IS NULL and IS NOT NULL
SQL NULL Values. If a column in a table is optional, we can insert a new record or update an
Null (SQL) - Wikipedia
Null (or NULL) is a special marker used in Structured Query Language to indicate that a data value does not exist in the database. Introduced by the creator of the relational database model, E. F. Codd...