Added in 1.0 and 1.5

The following reserved words were added in Firebird 1.0 and are still reserved in 1.5:

CURRENT_ROLE

CURRENT_USER

RECREATE

The following reserved words were added in Firebird 1.5:

BIGINT

CASE

CURRENT_CONNECTION

CURRENT_TRANSACTION

RELEASE

ROW_COUNT

SAVEPOINT

The following words are not reserved, but recognized as keywords by Firebird 1.5 if used in the proper context:

COALESCE

DELETING

INSERTING

LAST

LEAVE

LOCK

NULLIF

NULLS

STATEMENT

UPDATING

USING