Show all values in known tables that map a type id to a type name.
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-- Show types
-- Show post history types, post types and vote types.
SELECT Coalesce(PT.Id, PHT.Id, VT.Id) As [Id],
PT.Name As [Post],
PHT.Name As [Revision],
VT.Name As [Vote]
FROM PostTypes PT
FULL OUTER JOIN PostHistoryTypes PHT
ON PT.Id = PHT.Id
FULL OUTER JOIN VoteTypes VT
ON PT.Id = VT.Id OR PHT.Id = VT.Id