data modeling - Confusing about Database schema of SO -
i investigated sede need develop qa platform internal use, noticed there table votes storing user's upvote/downvote/favorite/etc posts, userid of table null when vote type upvote or downvote, illustrated here, there upvote & downvote history under profile's votes cast! how happen? tables exposed stackexchange incomplete, or missing something?
thanks reply.
this because stack exchange keeping information secret. hence userid
's left empty in public queryable votes table. information not present in datadumps.
you can query amounts. favorites, userid
seems available.
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