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DECLARE @range int = -12; -- 直近 12 時間のデータを取得 WHEN COALESCE(T1.num_of_reads - T2.num_of_reads,0) = 0 THEN 0 ELSE COALESCE(T1.num_of_reads - T2.num_of_reads,0) / COALESCE(DATEDIFF(ss, ...
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