One of the nice things about a new Oracle version is that very little has been removed that used to be in a previous version. This means that most of the things you learn in 8i will still be available in 10g. If I was attempting to learn Oracle again, I'd start with 10g. I get the 8i features as well as all of the 9i and 10g features to play with. There are a few things that get lost from version to version, but they are rare.
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