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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


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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  • 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, n. ¹ meanings, etymology and more | Oxford English Dictionary
    null, n ¹ meanings, etymology, pronunciation and more in the Oxford English Dictionary
  • Null Definition Meaning - YourDictionary
    Null definition: Having no legal force; invalid
  • NULL definition and meaning | Collins English Dictionary
    This means that it was null and of no effect Yet it is not a technical deficit but an emotional emptiness that renders this art so null But with a robust framework, a null result can be very important
  • What does NULL mean? - Definitions. net
    Null refers to the absence or nonexistence of something It can indicate the absence of a value or the lack of a particular attribute or characteristic In various contexts, null can represent a void, an empty state, or a placeholder that signifies the absence of information or a valid condition
  • 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
  • What is Null? – A Concise Explanation of Its Meaning and Concept
    Null is a fundamental concept in computing that represents a state of “nothingness ” Understanding the differences in how various programming languages and database systems handle Null is crucial for both beginners and experienced developers
  • 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 Definition Meaning | Dictionary. com
    NULL definition: without value, effect, consequence, or significance See examples of null used in a sentence





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