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Graeme Neatham wrote:

It might be useful to include an ID for the item's creator. I know this can be found by joining through the ItemID but keeping it in this table as well would enable faster queries concerning games inventors. It would also make it easier to stop creators rating their own games (UserID != CreatorID)

Actually, I want to encourage inventors to rate their own games. A game's inventor is usually the most experienced player of the game. As an inventor myself, I'm not expecting inventors to give top ratings to all of their games. I would give top ratings to some of my games and not to others. I don't think there is any need to add inventor ids to the table, because these can be retrieved easily enough from the Item table.

Will a user be able to revise their ratings? If so the table will need a timestamp field and possibly either a binary current/superseded field or a status field. Or previous ratings might have their own table

Yes, users will be able to revise their ratings. I don't see the need for a timestamp or other field. Old rating values will simply be replaced with new rating values.