mongodb數(shù)據(jù)如下：

db.cpc_0103.find()

{ "a" : 8, "b" : "108177_200701010000", "c" : 108177, "d" : 180, "e" : 1404917, "f" : "U盤", "g" : 184543, "h" : "U盤網(wǎng)上批發(fā)市場(chǎng)", "i" : 90, "j" : 3, "k" : 3, "l" : "", "m" : "2007-01-01 00:00:00", "n" : "", "o" : "", "p" : -1, "q" : "--", "r" : 0, "s" : "" }

......

......

如何對(duì)其中的一列數(shù)據(jù)SUM，

xreport-cpc:PRIMARY> var reduce = function(key, values){

... ...???? var count=0;

... ...???? values.forEach(function(v) {

... ...??????? count+=v.p;

... ...???? });

... ...???? return {count: count};

... ... };

xreport-cpc:PRIMARY> var reduce = function(key, values){

... var count=0;

... values.forEach(function(v) {

... count+=v.cm;

... });

... return {count: count};

... };

xreport-cpc:PRIMARY> var s = db.c.find();

xreport-cpc:PRIMARY> var s = db.test.find();

xreport-cpc:PRIMARY> reduce("total_cm", s);

?

執(zhí)行結(jié)果如下：

{ "count" : 20328860 }

?

轉(zhuǎn)載于:https://www.cnblogs.com/andashu/p/6406403.html

總結(jié)

以上是生活随笔為你收集整理的mongodb实现对某列求和SUM的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。