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我有云扳手查詢是潛在的許多子查詢,這是除了與每個子查詢變化幾個參數全部相同的UNION ALL
:如何讓UNION ALL更快?
(SELECT t.FirstName, t.BirthDate FROM Singers AS t WHERE SingerId=2 AND t.LastName="Trentor")
UNION ALL
(SELECT t.FirstName, t.BirthDate FROM Singers AS t WHERE SingerId=3 AND t.LastName="Smith")
UNION ALL
...
它有時以幾秒鐘的該查詢來執行。我能做些什麼來加快速度?
你剛剛回答你自己的問題嗎? – RSon1234