Заметка про NULL / Хабр

habr.com

12 сен 2011 ... Также, СУБД автоматически добавляет ограничение NOT NULL к ... select 1 from dual where dummy = null; -- запрос не вернёт записей

declared null and void - Перевод на русский - примеры ...

context.reverso.net

But it was clarified during the seminar held in Trinidad and Tobago on the question of New Caledonia that the referendum had been declared null and void  ...

Использование значения NULL в условиях поиска ...

www.sql-tutorial.ru

Предикат IS NULL позволяет проверить отсутствие (наличие) значения в полях таблицы. Использование в этих случаях обычных предикатов сравнения ...

MySQL SELECT только не null значения - sql | Qaru

qaru.site

SELECT val1 AS val FROM your_table WHERE val1 IS NOT NULL UNION ALL SELECT val2 FROM your_table WHERE val2 IS NOT NULL /*And so on for all ...

SELECT - Документация ClickHouse

clickhouse.yandex

Обычно это 0, пустая строка или NULL, в зависимости от типа элементов массива. Рассмотрим примеры использования ARRAY JOIN и LEFT ARRAY ...

Установка значения в NULL. Firebird РУКОВОДСТВО ...

it.wikireading.ru

Элемент данных может быть сделан NULL только в столбце, для которого не указано ограничение NOT NULL (СМ. разд. "Ограничение NOT NULL" ...

mysqli_result::fetch_assoc - Manual - PHP

www.php.net

Замечание: Эта функция устанавливает NULL-поля в значение NULL PHP. ... в массиве соответствует имени одного из столбцов выборки или NULL ...

6.3.1.4 Функции потока управления программой

www.mysql.ru

mysql> SELECT IFNULL(1,0); -> 1 mysql> SELECT IFNULL(NULL,10); -> 10 mysql> ... Эквивалентна оператору CASE WHEN x = y THEN NULL ELSE x END :

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Как явно задать тип для значения NULL в SELECT? - Stack ...

ru.stackoverflow.com

Надо столбцы привести к одному типу. Например для: create table table_1 ( col_1 number(10), col_2 number); create table table_2 (col ...

SQL NULL Values - IS NULL and IS NOT NULL

www.w3schools.com

The IS NULL Operator. 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

sql - Union to handle NULL values - Stack Overflow

stackoverflow.com

F7 null null null null E7 F8.

python - Select NULL Values in SQLAlchemy - Stack Overflow

stackoverflow.com

Here's my (PostgreSQL) table -- … I want to select all people that are not known to be married, i.e., including those with NULL marriage_status. This does not work -- … Of course this does -- …

sql - IN Clause with NULL or IS NULL - Stack Overflow

stackoverflow.com

Postgres is the database Can I use a NULL value for a IN clause? example: … I want to limit to these four values. I have tried the above statement and it doesn't work...

sql injection "union select null" - CodeProject

www.codeproject.com

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...

Слушать и скачать JnCE UNION ALL SELECT NULL NULL NULL...

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C# 6 features – Null-conditional (?. and ?[]) and null-coalescing...

csharp.today

Null-coalescing operator – ?? The null-coalescing operator was designed to be used easy with null-conditional operators. It provides default value when the outcome is null.

R null values: NULL, NA, NaN, Inf | R-bloggers

www.r-bloggers.com

In R language, NULL … Continue reading R null values: NULL, NA, NaN, Inf.

SQL – IS NULL, IS NOT NULL - fresh2refresh.com

fresh2refresh.com

Prev Next. Generally, NULL data represents data does not exist or missing data or unknown data. IS NULL & IS NOT NULL in SQL is used with a WHERE clause in SELECT, UPDATE and DELETE statements/queries to validate whether column has some value or data does not exist for that column.

Null - Wikipedia

en.wikipedia.org

Null may refer to: Null (SQL) (or NULL), a special marker and keyword in SQL indicating that something has no value. Null character, the zero-valued ASCII character, also designated by NUL, often used as a terminator, separator or filler. This symbol has no visual representation.

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