20.07.2021 14:50, Mark Rotteveel пишет:
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)).
Updatable vs non-updatable is correct.
In practice, this doesn't seem to be the case (see
This should be a bug. Maybe an old one, with wrong RDB$UPDATE_FLAG being
then preserved through backup-restore.
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?
It's set as explained above by Firebird, but the engine does not use
this information. It's intended for users.
Dmitry
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