// Requires official MongoShell 3.6+ use MediaNetDB; db.getCollection("TestCollection").aggregate( [ { "$project" : { "Day" : { "$dateToString" : { "format" : "%Y-%m-%d", "date" : "$AddDateTime" } }, "Time" : { "$dateToString" : { "format" : "%H:%M:%S:%L", "date" : "$AddDateTime" } } } }, { "$group" : { "_id" : { "Day" : "$Day" }, "count" : { "$sum" : 1.0 } } }, { "$project" : { "_id" : 0.0, "Day" : "$_id.Day", "Count" : "$count" } }, { "$sort" : { "Count" : -1.0 } } ], { "allowDiskUse" : false } ); ———————————————— 版權聲明:本文爲CSDN博主「Waldenz」的原創文章,遵循 CC 4.0 BY-SA 版權協議,轉載請附上原文出處連接及本聲明。 原文連接:https://blog.csdn.net/enter89/article/details/84937951