>> Exactly. Therefore FB 2.1 implemens standard MERGE statement.
>
> As UPDATE OR INSERT, yes? I think we lost MERGE after the alpha...or is it hiding in there?

We have both - custom UPDATE OR INSERT and standard MERGE.

We "lost" REPLACE which was renamed into UPDATE OR INSERT to
not confuse with MySQL's REPLACE (which is DELETE AND INSERT
internally)

Regards,
Vlad