What is null?

Question

What is null?

Answer 1

In programming, it refers to the 0 address in memory - if a variable is assigned 'null', it has no value and you generally can't do operations on it.

Answer 2

Null is an English word meaning 'nothing' or without value or consequence. It is derived from the Latin word nullus meaning 'none'.



Null may refer to:



Null (computer programming), a special value in computer programming

Null, in law, having no legal validity. See Void (law)

Null (mathematics), a zero value in several branches of mathematics

/dev/null, the null device in Unix-like operating systems, equivalent to the NUL device on CP/M, DOS, and Windows operating systems

Null (physics), a concept in electromagnetism and theoretical physics

Null (SQL), a special marker and keyword in SQL

Null allele (genetics), also see amorph

Null character, an ASCII value of 00 commonly used as a terminator, separator or filler

Null cipher, a ciphertext symbol

Null hypothesis, a hypothesis in statistics

Null morpheme, a concept in linguistics

Null result, the absence of the expected result in a scientific experiment

Null pointe, [fr] no points, "love" in tennis scoring

KK Null, a Japanese musician

The German word for zero

The Null Corporation, is the current imprint for Nine Inch Nails.

Answer 3

in many programming languages, null is a kind of value assigned 2 a field.

a NULL value can b defined as a value that is unknown, unassigned,unavailable or inapplicable and IN NO CASE EQUAL TO ZERO

Answer 4

Null is the absence of something. If it were quiet you could say there is a null in the noise.

Answer 5

null is nothing, blank, empty, no data.

it has no value

NULL does not mean '0', it means nothing, empty, nothing, zilch.



for example, if i used the following script:


$sentence="hello, this is the text";

if($sentence==NULL) //<<-- notice, i use null which means empty

{

echo "the sentence contains no data"; //say it contains nothing

}

else echo $phrase; //show the user the page

?>



that was pretty pointless but may help u to understand a bit better ^^^^^^^

Answer 6

Null is a type which cant hold a value i.e. always empty.

Answer 7

null= nothing or 0.

Answer 8

null refers to something which is completely vacant ..or it has no any value not even zero

Answer 9

null is empty or zero

Answer 10

as in "null and void"???

if so, it means basically worthless, thrown out, no good, done with, not withstanding, etc.

Answer 11

Isn't it Zero in French?

Answer 12

zero

Answer 13

http://en.wiktionary.org/wiki/null

http://en.wikipedia.org/wiki/Null_(SQL)

http://en.wikipedia.org/wiki/Null

Answer 14

nothing: a quantity of no importance