sql巨慢之utf8mb4的隐藏问题

背景 某天 小伙伴发现一条sql巨慢无比 该sql十分长 咱们来看一下java select '1' AS type, '项目' 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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