Question

我的藏品中有以下文件：

{ "_id" : ObjectId("5785e5649b732ab238cfc519"), "name" : "Apple", "category" : "Fruit", "price" : 100, "discount" : 5 }
{ "_id" : ObjectId("5785e5709b732ab238cfc51a"), "name" : "Orange", "category" : "Fruit", "price" : 90, "discount" : 5 }
{ "_id" : ObjectId("5785e5819b732ab238cfc51b"), "name" : "PineApple", "category" : "Fruit", "price" : 60, "discount" : 2 }
{ "_id" : ObjectId("5785e5969b732ab238cfc51c"), "name" : "Potatto", "category" : "Vegetable", "price" : 10, "discount" : 1 }
{ "_id" : ObjectId("5785e5c39b732ab238cfc51d"), "name" : "Cabbage", "category" : "Vegetable", "price" : 5, "discount" : 1 }

和预期结果

{ "_id" : { "category" : "Vegetable" }, "total" : 15 }

我正在使用mongoDB查询来查找带有蔬菜类别的总数，如下所示

db.stall.aggregate([{$group: {_id: {category: "Vegetable" }, total: {$sum: "$price"}}}]);

但我得到以下结果

{ "_id" : { "category" : "Vegetable" }, "total" : 265 }

如何找到蔬菜类别的总列数和折扣列的总和。

Answer 1

我不确定我的问题是否正确，但这会过滤价格和蔬菜类别折扣总和。

    array() { 
[74]=> int(1467295200)
[75]=> int(1467381600)
[76]=> int(1467468000)
[77]=> int(1467554400)
[48]=> int(1467639000)
[78]=> int(1467640800)
[79]=> int(1467727200)
[36]=> int(1468243800)
[49]=> int(1468243800)
[30]=> int(1468285200)
[24]=> int(1468287000)
[18]=> int(1468288800)
[12]=> int(1468290600)
[6]=> int(1468292400)
[37]=> int(1468330200)
[31]=> int(1468458000)
[25]=> int(1468459800)
[19]=> int(1468461600)
[13]=> int(1468463400)
[7]=> int(1468465200)
[38]=> int(1468503000)
[32]=> int(1468544400)
[26]=> int(1468546200)
[20]=> int(1468548000)
[14]=> int(1468549800)
[8]=> int(1468551600)
[39]=> int(1468589400)
}

2列的MongoDB SUM

1 个答案: