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.
That which has no value; a cipher; zero.
n. a special value used on coins, tiles, and dice; the default numerical equivalent for a null is 0, but rulesets often ascribe special meaning to the null; a null is represented by the absence of a number or symbol
A value that is not defined.
missing or redundant null check
An absence of information used as a positive confirmation of no information, as opposed to using a `0' or a blank. A null value is binary zeros.
When a variable has no value, it considered to be null. Having a null value is ...
This term means having no value.
In programming and UNIX terms, the representation for a missing or empty value.
(IEEE) A value whose definition is to be supplied within the context of a specific operating system. This value is a representation of the set of no numbers or no value for the operating system in use.
A psuedo value that means a column contains nothing. This is distinct from an empty string, zero, or any other possible data value.
A value that indicates missing or unknown data. Null values can be entered in fields for which information is unknown and in expressions and queries. In Visual Basic, the Null keyword indicates a Null value. Some fields, such as those defined as containing the primary key, can't contain Null values. .
Empty or having no members. This is in contrast to a blank or zero, which indicates the presence of no information. For example, in the number 540, zero contains needed information.
A Java(TM) programming language keyword used to specify an undefined value for reference variables.
lacking any legal or binding force; "null and void"
a missing, unknown, or inapplicable value
an undefined and unknown value
a special value type, and means that the value is not known (yet)
Nothing. Empty. Zero. A "null packet" is one that does not contain any information; it usually means that the network's transport layer is clear and ready for a new packet. Mentioned in: Network Communication.
A point in an antenna's radiation pattern at which the gain is zero.
An absent, unknown, or not yet known value. It should not be confused with zero, which is a value.
Empty. A field or variable that has no value associated with it is null.
An entry that has no explicitly assigned value. NULL is not equivalent to zero or blank. A value of NULL is not considered to be greater than, less than, or equivalent to any other value, including another value of NULL.
An unknown or indeterminate value. It is not equivalent to zero or blank. A null is not even necessarily equivalent to another null.
A value indicating that a variable contains no valid data. A variable will typically be set to Null in a database context, in situations where a field contains no data or a recordset contains no records.
(SQL) A special constant value, compatible with any data type, that means "this field doesn't have any value assigned to it." phone.php
A null production is a rule that has an empty right part. For example: OptionalList
A special value that indicates the absence of information or that the information is unknown.
A non-entry. A null is different from either an entry of zero or an entry of a blank space.
A value indicating that a variable contains no valid data. Null is the result of: An explicit assignment of Null to a variable. Any operation between expressions that contain Null.
A term used mainly within database systems, SQL and programming languages, to indicate that a field has no value. This is subtly, but importantly different, from assigning a value which means 'blank', 'empty' or 'no data'.
non-data, the absence of data
The null type has one value, the null reference, represented by the literal null, which is formed from ASCII characters. A null literal is always of the null type.
adj., adj. a. (of a list) having no elements: empty. See empty list. b. (of a string) having a length of zero. (It is common, both within this document and in observed spoken behavior, to refer to an empty string by an apparent definite reference, as in "the null string" even though no attempt is made to intern 2 null strings. The phrase "a null string" is technically more correct, but is generally considered awkward by most Lisp programmers. As such, the phrase "the null string" should be treated as an indefinite reference in all cases except for anaphoric references.) c. (of an implementation-defined attribute of a character) An object to which the value of that attribute defaults if no specific value was requested. 2. an object of type null (the only such object being nil).
Empty, having no value, containing nothing.
An empty field. Use NVL to replace a NULL with a designated value.
Empty, zero-length, with no characters - for example, a null string. This is not the same as an ASCII NUL ( 51.3) character.
A field with no value. This is not the same as a 0 or a zero-length string. Use Is Null in the criteria grid of a query to find fields without an entry.
A character that has all the binary digits set to zero(ASCII 0), and therefore has no value. In programming, a null character is used for severa special purposes, including padding fields, or serving as delimiter characters. In the C language, for example, a null character indicates the end of a character string.
The name for an EBCDIC character that represents hex 00. See null character. In DB2 UDB for AS/400, a special value that indicates the absence of information.
null is a special value that indicates a variable doesn't refer to any object. The value null may be assigned to any class or interface variable. It cannot be cast to any integral type, and should not be considered equal to zero, as in C.
VOID - Having no legal force or effect; of no worth; unenforceable; not binding. OBSOLESCENCE - A type of depreciation of property.
A data value that is unknown or unspecified. Java has a distinguished null object value, and SQL has a distinguished null value that represents the absence of an actual value.
The null character () that is used in C programs to terminate strings. O-Q
The state of lacking a value. A field in a database has "null" value before it is assigned a value.
The absence of a value for a given item. A null implies nothing more than "a value is not applicable" or "the value is unknown." Nulls are not equal to any other value, even to each other. Comparisons with nulls are always false. In SQL*Forms, a null character field is not equal to a blank or a value zero characters long, nor is a null numeric field equal to a zero. To prohibit null values, define a column as NOT NULL.
Empty; describes an item, object, variable, etc. that has no value. Note that a NULL character text item is not the same as a blank text item or a text item whose value is zero characters long; similarly, a NULL numerical text item is not the same as a numerical text item whose value is zero.
In direction-finding systems wherein the output amplitude is a function of the direction of arrival of the signal, the minimum output amplitude (ideally zero). The null is frequently employed as a means of determining bearing. The term minimum is often used to indicate an imperfect null.
1. Equal to zero. 2. Non-binding, void.
The zero level in an electric circuit.
null value represents missing, unknown, or inapplicable data. Do not use null to represent a value of zero, because they are not equivalent. Any arithmetic expression containing a null always evaluates to null. For example, 10 + NULL = NULL. In fact, all operators (except concatenation) return null when given a null operand.
Attributes in tables in SQL database management systems can optionally be designated as NULL. This indicates that the actual value of the column is unknown or not applicable.
In mathematics, the word null (from Latin nullus, meaning "none") may or may not have a meaning different from zero. Sometimes the symbol Ø is used to distinguish "null" from 0.
