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NULL    音標拼音: [n'ʌl]
n. 空,零迅號,零
a. 無效力的,無效的,無價值的

空,零迅號,零無效力的,無效的,無價值的

null
空的; 空; 無; 零; 空白; 虛字; 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關資料:
  • javascript - Why is null an object and whats the difference between . . .
    The surprise expressed by JavaScript developers at typeof null === "object" is the result of an impedance mismatch (or abstraction leak) between a weakly-typed language (JavaScript) that has both null and undefined, and another, strongly-typed language (Java) that only has null, and in which null is strictly defined to refer to a reference type
  • c# - What does null! statement mean? - Stack Overflow
    null! is used to assign null to non-nullable variables, which is a way of promising that the variable won't be null when it is actually used I'd use null! in a Visual Studio extension, where properties are initialized by MEF via reflection:
  • sql - Not equal lt; gt; != operator on NULL - Stack Overflow
    Which is why you can only use IS NULL IS NOT NULL as predicates for such situations This behavior is not specific to SQL Server All standards-compliant SQL dialects work the same way Note: To compare if your value is not null, you use IS NOT NULL, while to compare with not null value, you use <> 'YOUR_VALUE' I can't say if my value equals
  • What is the difference between is not null and != null?
    is not null helps the null state analyzer track nullability, != null only checks at runtime Therefore, pattern matching can prevent null reference exceptions, particularly in LINQ chains where null state tracking is important Pattern matching verifies null safety throughout the entire chain
  • SQL is null and = null - Stack Overflow
    The reasoning is that a null means "unknown", so the result of any comparison to a null is also "unknown" So you'll get no hit on rows by coding where my_column = null SQL provides the special syntax for testing if a column is null, via is null and is not null, which is a special condition to test for a null (or not a null)
  • What is null in Java? - Stack Overflow
    The null reference is the only possible value of an expression of null type The null reference can always be cast to any reference type In practice, the programmer can ignore the null type and just pretend that null is merely a special literal that can be of any reference type
  • Why does NULL = NULL evaluate to false in SQL server
    The expression "NULL = NULL" evaluates to NULL, but is actually invalid in SQL; yet ORDER BY treats NULLs as equal (whatever they precede or follow "regular" values is left to DBMS vendor) The expression "x IS NOT NULL" is not equal to "NOT(x IS NULL)", as is the case in 2VL
  • Java null check why use == instead of . equals() - Stack Overflow
    @RogerWang - Good question! The answer is that null isn't an object, it's an object reference (a blank one) It's the only object reference we can write literally in code So Object a = null; Object b = null; means that a == b is true, because both variables contain the same object reference (the single universal blank one) –





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