According to the Firebird Language Reference[1], the
RDB$RELATION_FIELDS.RDB$UPDATE_FLAG signals whether a column is a
computed column (0) or a regular column (1) (or I guess, updatable (1)
vs not-updatable (0)). In practice, this doesn't seem to be the case
(see
https://stackoverflow.com/questions/68451712/finding-computed-fields-in-firebird-2-5
and https://github.com/FirebirdSQL/firebird-documentation/issues/157).
Helen's Firebird Book lists this column as 'not used by Firebird'.
So, is this column truly not used by Firebird?
Mark
[1]:
https://www.firebirdsql.org/file/documentation/html/en/refdocs/fblangref25/firebird-25-language-reference.html#fblangref-appx04-relfields
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