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mysql不同表数据求和并排序问题

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mysql不同表数据求和并排序问题

主表 a
收入表 b b.a_id=a.id 有多条a_id数据
导入收入表 c c.a_id=a.id 有多条a_id数据

laravel写的，以前功能都有，现在要做个排行榜,要求表a的各个id的总收入并降序排序，不合并表bc的情况下，mysql该怎么查


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by (71.8m points)

啥叫不合并表?（不连表？）
直接连表分组统计就行了
非要不连表，子查询也能做


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