> Basically, you would be creating your own data dictionary (i.e. > system catalog) on top of the db data dictionary. The database > already comes with a way to easily add columns: ddl. I have seen > newbie database designers reinvent this method a hundred times. The > performance hits and complexity of querying data would far out weigh > any perceived maintenance gain. And I thought that this would make me a famous database designer ;-), well, given the deadline for this + other concerns it looks like implementing my own type system is over-kill (+ it would be impossible for "normal" users to write report queries). Thank you all for input, i will do it the "normal" way. Vlad ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match