Oracle Database Discussions

I wonder if someone could tell me if it’s possible to do the following:

I would like to retrieve a collection of rowids such that each incremental rowid defines a certain number of records (200,000 in this example). Here’s how this might look:

Rowid(1)
Rowid(2)
Rowid(3)
…
Rowid(x)

Where: Select count(1) from table_a where rowid between rowid(1) and rowid(2)=200,000.

So, the question is – Is it possible to get the rowid for every 200,000th row in a large table?

I know, this seems pretty strange, and you no doubt wonder why I’m not using a user-defined key, but that’s impossible in this case.

Thanks for your help,

Tom