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1 Variant data type
"The default data type for variables that don't have type-declaration characters when a Deftype statement isn't in effect. A Variant can store numeric, string, date/time, Null, or Empty data." -
2 Yes/No data type
"A field data type you use for fields that will contain only one of two values, such as Yes or No and True or False. Null values are not allowed."نوع بيانات نعم/لا -
3 nullable type
"In C#, an instance of the System.Nullable struct that can represent the normal range of values for its underlying value type, plus an additional null value." -
4 left outer join
"A type of outer join in which all rows from the left-most table in the JOIN clause are included. When rows in the left table are not matched by rows in the right table, all result set columns that come from the right table are assigned a value of NULL."
См. также в других словарях:
Null (SQL) — The Greek lowercase omega (ω) character is used to represent Null in database theory. Null is a special marker used in Structured Query Language (SQL) to indicate that a data value does not exist in the database. Introduced by the creator of the… … Wikipedia
Null (Intronaut EP) — Infobox Album | Name = Null Type = studio Artist = Intronaut Released = February 28, 2006 Recorded = April, 2005 Genre = Post metal Progressive metal Length = 28:25 Label = Goodfellow Producer = Reviews = * Allmusic Rating|2.5|5… … Wikipedia
Null — Pour le musicien japonais, voir Kazuyuki K. Null. NULL est un mot clef présent dans de nombreux langages informatiques, et qui désigne l état d un pointeur qui n a pas de cible ou d une variable qui n a pas de valeur. La notion de valeur ou … Wikipédia en Français
Null Object pattern — Null object redirects here. For the concept in category theory, see Initial object. In object oriented computer programming, a Null Object is an object with defined neutral ( null ) behavior. The Null Object design pattern describes the uses of… … Wikipedia
Null — may refer to: Contents 1 In computing 2 In art 3 In mathematics 4 In science 5 People … Wikipedia
Type I and type II errors — In statistics, the terms Type I error (also, α error, or false positive) and type II error (β error, or a false negative) are used to describe possible errors made in a statistical decision process. In 1928, Jerzy Neyman (1894 1981) and Egon… … Wikipedia
NULL — Pour le musicien japonais, voir Kazuyuki K. Null. NULL est un mot clef présent dans de nombreux langages informatiques, et qui désigne l état d un pointeur qui n a pas de cible ou d une variable qui n a pas de valeur. La notion de valeur ou de… … Wikipédia en Français
Null function — Not to be confused with identity function or empty function. In computer science, a null function (or null operator) is subroutine that returns no data values and leaves the program state unchanged. When it is part of the instruction set of… … Wikipedia
NULL (Си) — У этого термина существуют и другие значения, см. NULL. NULL в языках программирования Си и C++ макрос, объявленный в заголовочном файле stddef.h (и других заголовочных файлах). Значением этого макроса является зависящая от реализации… … Википедия
Null allele — A null allele is a mutant copy of a gene that completely lacks that gene s normal function. This can be the result of the complete absence of the gene product (protein, RNA) at the molecular level, or the expression of a non functional gene… … Wikipedia
Null character — For other uses, see Null symbol. The null character (also null terminator), abbreviated NUL, is a control character with the value zero.[1] [2] It is present in many character sets, including ISO/IEC 646 (or ASCII), the C0 control code, the… … Wikipedia
