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索引字段SELECT b.id, pack_type AS packType, logistics_template AS logisticsTemplate, is_print AS isPrint, print_user AS printUser, DATE_FORMAT( create_tm, '%Y-%m-%d %H:%i:%s' ) AS createTm, is_check AS isCheck, is_cancel AS isCancel, print_inde

Mysql强制使用索引force index(索引名称),前置条件需要先建立要强制的单个索引