Coco_chun的博客

mongodb笔记

Aggregation：参数说明：sql(Operators) where ($match) 、group by ($group)、having($match)、select($project)、order by($sort)、limit($limit) sum($sum)、count($sum)、join($lookup)SELECT cust_id,SUM(price) as totalFROM ordersWHERE status = 'A'GROUP B...