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1 null field
"A field containing a Null value. A null field isn't the same as a field that contains a zero-length string ("" "") or a field with a value of 0." -
2 null
Pertaining to a value that indicates missing or unknown data. -
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 (computer programming) — Null has several meanings in computer programming.;Null pointer or null reference * Null is a special pointer value (or other kind of object reference) used to signify that a pointer intentionally does not point to (or refer to) an object. Such a … Wikipedia
Null — Null, a. [L. nullus not any, none; ne not + ullus any, a dim. of unus one; cf. F. nul. See {No}, and {One}, and cf. {None}.] 1. Of no legal or binding force or validity; of no efficacy; invalid; void; nugatory; useless. [1913 Webster] Faultily… … The Collaborative International Dictionary of English
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 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
null — / nəl/ adj [Anglo French nul, literally, not any, from Latin nullus, from ne not + ullus any]: having no legal or binding force: void a null contract Merriam Webster’s Dictionary of Law. Merriam Webster. 1996 … Law dictionary
null — [nʌl] adjective [only before a noun] 1. STATISTICS a null effect, result etc is one that is zero or nothing 2. LAW another name for null and void: • Their suit also asks the court to declare null the buyer s shareholder rights plan. * * * … Financial and business terms
null — [nul] adj. [MFr nul < L nullus, not any, none < OL * n(e) oin(o)los, not a one < ne, not (see NO1) + dim. of oinos < IE * oinos: see ONE] 1. without legal force; not binding; invalid: usually in the phrase null and void 2. amounting… … English World dictionary
Null — Null, n. 1. Something that has no force or meaning. [1913 Webster] 2. That which has no value; a cipher; zero. Bacon. [1913 Webster] {Null method} (Physics.), a zero method. See under {Zero}. [1913 Webster] … The Collaborative International Dictionary of English
Null method — Null Null, n. 1. Something that has no force or meaning. [1913 Webster] 2. That which has no value; a cipher; zero. Bacon. [1913 Webster] {Null method} (Physics.), a zero method. See under {Zero}. [1913 Webster] … The Collaborative International Dictionary of English
null — [ nʌl ] adjective with no value or effect null and void LEGAL with no legal effect: Due to irregularities, the election has been declared null and void … Usage of the words and phrases in modern English
