ORACLE user names and tables

I work with several different "flavors" of databases, and with the others, if you decide to delete a user and all of that user's associated data, it's quite easy , but in ORACLE, once you create a user name, it's there for life, it seems, unless someone can tell me otherwise.

It seems to me that this would be a VERY basic function, being able to undo what you do, or to delete a user and that user's tables with one command, but I HAVE NEVER FOUND IT!

Any help is DEEPLY appreciated, thanks!

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