按日期分组，然后按货币和总和 mongodb 记录答案

【问题标题】：group by date and then by currecny and sum mongo records按日期分组，然后按货币和总和 mongodb 记录
【发布时间】：2015-09-15 20:32:59
【问题描述】：

我的 mongo 数据库中有以下记录

> db.orders.find({});
{
    "_id" : "WEB3",
    "currency" : "USD",
    "company" : "b",
    "user_id" : "b",
    "timestamp" : ISODate("2015-06-26T12:13:18.570Z"),
    "details" : {
        "ordered" : {
            "total" : 1910.4,
            "deliveryVAT" : 120,
            "delivery" : 600,
            "goodsVAT" : 198.4,
            "goodsTotal" : 992
        }
    }
}
{
    "_id" : "WEB1",
    "currency" : "GBP",
    "company" : "a",
    "user_id" : "a",
    "timestamp" : ISODate("2015-06-26T12:11:08.570Z"),
    "details" : {
        "ordered" : {
            "total" : 1910.4,
            "deliveryVAT" : 120,
            "delivery" : 600,
            "goodsVAT" : 198.4,
            "goodsTotal" : 992
        }
    }
}
{
    "_id" : "WEB2",
    "currency" : "GBP",
    "company" : "a",
    "user_id" : "a",
    "timestamp" : ISODate("2015-06-26T12:11:18.570Z"),
    "details" : {
        "ordered" : {
            "total" : 1910.4,
            "deliveryVAT" : 120,
            "delivery" : 600,
            "goodsVAT" : 198.4,
            "goodsTotal" : 992
        }
    }
}

这里是插入语句：

db.orders.insert( { "_id" : "WEB1", "currency" : "GBP", "company" : "a", "user_id" : "a", "timestamp" : ISODate("2015-06-26T12:11:08.570Z"), "details" : { "ordered" : { "total" : 1910.4, "deliveryVAT" : 120, "delivery" : 600, "goodsVAT" : 198.4, "goodsTotal" : 992 } } });
db.orders.insert( { "_id" : "WEB2", "currency" : "GBP", "company" : "a", "user_id" : "a", "timestamp" : ISODate("2015-06-26T12:11:18.570Z"), "details" : { "ordered" : { "total" : 1910.4, "deliveryVAT" : 120, "delivery" : 600, "goodsVAT" : 198.4, "goodsTotal" : 992 } } });
db.orders.insert( { "_id" : "WEB3", "currency" : "USD", "company" : "b", "user_id" : "b", "timestamp" : ISODate("2015-06-26T12:13:18.570Z"), "details" : { "ordered" : { "total" : 1910.4, "deliveryVAT" : 120, "delivery" : 600, "goodsVAT" : 198.4, "goodsTotal" : 992 } } });

按日期分组然后按货币分组的正确方法是什么，这样我得到的结果类似于：

{ [ "date": "2015-06-26",
  "currency": "USD",
  "total": 1910.4,
  "no_of_orders": 1],
  [ "date": "2015-06-26",
  "currency": "GBP",
  "total": 3820.8,
  "no_of_orders": 2]]
}

从以前的帖子mongodb sort result of aggregate query and display day name 我可以得到每天的订单数量，但是我不确定如何通过管道传输结果并按货币拆分，然后汇总结果？

非常感谢任何建议

【问题讨论】：

标签： mongodb

【解决方案1】：

您可以尝试以下聚合管道，该管道按年-月-日和货币对文档进行分组以获得所需的结果：

db.orders.aggregate([
    { 
        "$group": { 
            "_id": {
                "day": { "$dayOfMonth" : "$timestamp" },
                "month": { "$month" : "$timestamp" },
                "year": { "$year" : "$timestamp" },
                "currency": "$currency"
            }, 
            "total": { "$sum": "$details.ordered.total" },
            "no_of_orders": { "$sum": 1 }
        } 
    },
    { 
        "$project": { 
            "_id": 0, 
            "dateDay": {
                "$concat": [ 
                    {"$substr" : [ "$_id.day", 0, 2]}, "-",
                    {"$substr" : [ "$_id.month", 0, 2]}, "-",
                    {"$substr" : [ "$_id.year", 0, 4]}
                ] 
            },            
            "total": 1,
            "no_of_orders": 1,
            "currency": "$_id.currency"
        }

    }
])

样本输出

/* 0 */
{
    "result" : [ 
        {
            "total" : 1910.4,
            "no_of_orders" : 1,
            "dateDay" : "26-6-2015",
            "currency" : "USD"
        }, 
        {
            "total" : 3820.8,
            "no_of_orders" : 2,
            "dateDay" : "26-6-2015",
            "currency" : "GBP"
        }
    ],
    "ok" : 1
}

【讨论】：