Использование значения NULL в условиях поиска ...
Предикат IS NULL позволяет проверить отсутствие (наличие) значения в полях таблицы. Использование в этих случаях обычных предикатов сравнения ...
Заметка про NULL / Хабр
12 сен 2011 ... Специальное значение NULL означает отсутствие данных, .... select 1 from dual where dummy = null; -- запрос не вернёт записей
declared null and void - Перевод на русский - примеры ...
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 ...
999999.9' /-1661/**/union/**/all/**/select/**/null,null,concat ...
If you had SELECT * FROM users and users had 4 columns, the UNION must also have 4 columns. As a result, they just used `NULL values to populate those ...
SELECT - Документация ClickHouse
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 ...
Элемент данных может быть сделан NULL только в столбце, для которого не указано ограничение NOT NULL (СМ. разд. "Ограничение NOT NULL" ...
DbExpressionBuilder.Null(TypeUsage) Method (System.Data ...
public static System.Data.Common.CommandTrees.DbNullExpression Null (this System.Data.Metadata.Edm.TypeUsage nullType); static member Null : System.
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mysqli_fetch_assoc()
Замечание: Эта функция устанавливает NULL-поля в значение NULL PHP. ... в массиве соответствует имени одного из столбцов выборки или NULL ...
Вывод дерева блокировок на T-SQL
locks','U') is not null drop table #locks; create table #locks ( spid smallint not null, kpid smallint not null, blocked smallint not null, lastwaittype nchar(32) not null, ...
SQL using If Not Null on a Concatenation - Stack Overflow
If I have the table … This will display Firstname-Middlename-Surname e.g. … The second one (Jane’s) displays correct, however since John doesn’t have a middlename, I want it to ignore the second dash.
sql - Union to handle NULL values - Stack Overflow
select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null,null,e,f from table3.
sql - IN Clause with NULL or IS NULL - Stack Overflow
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 is null and = null - Stack Overflow
What is the difference between … and … and why does the latter not work?
sql - isnull vs is null - Stack Overflow
I have noticed a number of queries at work and on SO are using limitations in the form: … Is there a particular reason why people do that and not the more terse … Is it a legacy or a performance issue?
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
Слушать и скачать JnCE UNION ALL SELECT NULL NULL NULL...
Calling All Cars Ghost House Death Under The Saquaw The Match Burglar. 192 Kbps 115.02 MB 01:27:24 45.
count not null values of all columns from a table - SQLRelease
There are total 14 not null values in all the columns and 22 NULL values in all columns. And below we are trying to get this count in two different
SQL WHERE IS NULL | SELECT WHERE IS NOT NULL | NULL or...
NULL is a special value that signifies 'no value'. Comparing a column to NULL using the = operator is undefined. Instead, use WHERE IS NULL or WHERE IS NOT
Null allele - Wikipedia
A null allele is a nonfunctional copy of a gene caused by a genetic mutation. This mutation can cause complete lack of production of the associated gene product or a product that does not function properly. A null allele cannot be distinguished from deletion of the entire locus solely from phenotypic...