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Why won't SQL Server optimize the UNIONs?
Consider these queries (SQL Fiddle): Query 1: SELECT * INTO #TMP1 FROM Foo UNION SELECT * FROM Boo UNION SELECT * FROM Koo; Query 2: SELECT * INTO #TMP2 FROM Foo UNION SELECT * FROM Boo UNION ALL ...
Dec 11 '12 at 11:34
newest optimizer union questions feed
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