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NULL    音标拼音: [n'ʌl]
n. 空,零迅号,零
a. 无效力的,无效的,无价值的

空,零迅号,零无效力的,无效的,无价值的

null
空的; 空; 无; 零; 空白; 虚字; 空( 字元 ) NUL

null
空

null
adj 1: lacking any legal or binding force; "null and void" [synonym:
{null}, {void}]
n 1: a quantity of no importance; "it looked like nothing I had
ever seen before"; "reduced to nil all the work we had
done"; "we racked up a pathetic goose egg"; "it was all for
naught"; "I didn't hear zilch about it" [synonym: {nothing},
{nil}, {nix}, {nada}, {null}, {aught}, {cipher}, {cypher},
{goose egg}, {naught}, {zero}, {zilch}, {zip}, {zippo}]

Null \Null\, v. t. [From null, a., or perh. abbrev. from annul.]
To annul. [Obs.] --Milton.
[1913 Webster]


Null \Null\, n. [Etymol. uncertain.]
One of the beads in {nulled work}.
[1913 Webster]


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 faultless, icily regular, splendidly null,
Dead perfection; no more. --Tennyson.
[1913 Webster]

2. Having a value of zero; as, of null utility.
[PJC]

3. (Math.) Empty; having no members; as, the null set.
[PJC]

4. (Computers) Unassigned or meaningless; -- a special value
given to variables, especially pointers or logical
variables, indicating that it is meaningless and cannot be
used in computation; as, an uninitialized pointer in "C"
is given a null value. The actual value that is stored in
memory to indicate the null condition may vary with the
computer language used.
[PJC]


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]

51 Moby Thesaurus words for "null":
aimless, bad, bare, barren, bland, blank, bleached, characterless,
clear, designless, devoid, empty, existless, featureless, garbled,
hollow, importless, inane, ineffective, ineffectual, inefficacious,
insignificant, insipid, invalid, lacking, meaningless, minus,
missing, negative, nonconnotative, nondenotative, nonexistent,
null and void, phatic, purportless, purposeless, scrambled,
senseless, unexisting, unmeaning, unrelieved, unsignificant,
useless, vacant, vacuous, void, white, with nothing inside,
without being, without content, worthless

A special value used in several languages to
represent the thing referred to by an uninitialised pointer.

A special value that may be stored in some database
columns to represent an unknown, missing, not applicable, or
undefined value. Nulls are treated completely differently
from ordinary values when evaluating SQL expressions and there
are several SQL constructs for dealing with nulls.

(2003-06-17)


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英文字典中文字典相关资料:


  • NULL Definition Meaning - Merriam-Webster
    Null often pops up in legal and scientific contexts; it was originally used in Scottish law and still carries the meaning "having no legal or binding force," especially in the phrase "null and void "
  • Null - Glossary | MDN
    In computer science, a null value represents a reference that points, generally intentionally, to a nonexistent or invalid object or address The meaning of a null reference varies among language implementations
  • ! (null-forgiving) operator - C# reference | Microsoft Learn
    By using the null-forgiving operator, you inform the compiler that passing null is expected and shouldn't generate a warning You can also use the null-forgiving operator when you definitely know that an expression can't be null but the compiler doesn't recognize that
  • Null - Wikipedia
    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
  • NULL Definition Meaning | Dictionary. com
    NULL definition: without value, effect, consequence, or significance See examples of null used in a sentence
  • Null Alternative Hypotheses | Definitions, Templates Examples - Scribbr
    The null and alternative hypotheses are two competing claims that researchers weigh evidence for and against using a statistical test: Null hypothesis
  • What Is Null? - Computer Hope
    The concept of null and its significance in computing with our comprehensive definition, examples, and explanations Learn how null differs from zero and empty
  • SQL NULL Values - IS NULL and IS NOT NULL - W3Schools
    A NULL value represents an unknown, missing, or inapplicable data in a database field It is not a value itself, but a placeholder to indicate the absence of data
  • A quick and thorough guide to ‘null’: what it is, and how you should . . .
    In this comprehensive guide, targeted at both novice and seasoned coders, we will unpack the enigma that is null The aim is to develop an intuitive understanding of what null is, how it works, when and why to use it, as well as mastery over best practices for handling null safely
  • NULL - cppreference. com
    A null pointer constant may be converted to any pointer type; such conversion results in the null pointer value of that type





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