我正在尝试使用单个集合来子查询数据。 等价的SQL查询: Select * from customer where custid = (select custid from customer where device ID = 123 and date <= currentdate fetch first row only) where date<= current date
我正在我的mongo集群上运行一个groupBy query。我正在使用在线工具。运行查询后,我将得到一个错误。数据大小很大。有绕道的路吗?SELECT COUNT(*) AS count FROM db_nameGROUP BY id
db.db_name.group({ "id": true"initial": {},
"reduce&