posts q left join users u on q.OwnerUserId=u.id where q.id=37449
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--select q.*, u.* from --posts q left join users u on q.OwnerUserId=u.id --where q.id=37449 select OwnerDisplayNameCased = case q.OwnerDisplayName when null then 'Null' else 'NotNull' end, OwnerDisplayName from posts q where q.id=37449