sql巨慢之utf8mb4的隱藏問題

背景 某天 小夥伴發現一條sql巨慢無比 該sql十分長 咱們來看一下java select '1' AS type, '項目' AS type_name, sc.name AS businessName, SUM(IFNULL(a.service_actual_cash,0)) AS cash, SUM(IFNULL(a.service_actual_card,0)) AS bank_card,

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