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Computing (FOLDOC) dictionary (also found in English - Vietnamese, English - English (Wordnet), Vietnamese - Vietnamese)
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programming A special value used in several languages to
represent the thing referred to by an uninitialised pointer.
database 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.