i think SAP bought the source of ADABAS and published it under GPL license - but i'm not that sure.i got the impression that the sap-db is almost (if not totally) the same rdbms as the good old ADABAS-D 11. some parameters and/or limits seemed to be lifted, but i didn't check them all till now.
- is sap-db 7.x identical to ADABAS-D 11 ?
not really. it has been partly rewritten.
neither nor.- is sap-db a subset or a superset of ADABAS-D 11 ?
some additions were made (=> superset)
and some things were removed (=> subset)
for example there're DEFAULT SERIAL columns now, and one can query the last inserted value via TABLE.CURRVAL. I don't know if Adabas had something like that.
The JOIN USING (column) syntax was removed and only JOIN ON (condition) is the only valid JOIN syntax.
I think you can port any application using ANSI-SQL with very little effort.
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