I'm sorry, i'd be very surprised if that were possible.
For starters ePO is solely generated around Microsoft Sql.
I doubt you'd even be able to make it recognise the Oracle DB, let alone query it.
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I haven't tried with the API but I do use the ePOwerShell tool by mischaboender to apply tags. You could have a PowerShell script query the database and then apply the tag that way.
You can get it from the Tool Exchange...
Thanks for the quick reply. I will take a look at ePOwerShell tool. I will report back what I find.