NULL

Null

Null is a special marker used in Structured Query Language to indicate that a data value does not exist in the database. Introduced by the creator of the relational database model, E. F. Codd, SQL Null serves to fulfill the requirement that all true relational database management systems support a representation of "missing information and inapplicable information". Codd also introduced the use of the lowercase Greek omega symbol to represent Null in database theory. NULL is also an SQL reserved keyword used to identify the Null special marker.

The above text is a snippet from Wikipedia: Null (SQL)
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null

Noun

  1. A non-existent or empty value or set of values.
  2. Zero quantity of expressions; nothing.
  3. Something that has no force or meaning.
  4. the ASCII or Unicode character (), represented by a zero value, that indicates no character and is sometimes used as a string terminator.
  5. the attribute of an entity that has no valid value.
    Since no date of birth was entered for the patient, his age is null.
  6. One of the beads in nulled work.

Verb

  1. to nullify; to annul

Adjective

  1. Having no validity, "null and void"
  2. insignificant
  3. absent or non-existent
  4. of the null set
  5. of or comprising a value of precisely zero
  6. causing a complete loss of gene function, amorphic.


The above text is a snippet from Wiktionary: null
and as such is available under the Creative Commons Attribution/Share-Alike License.

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