[英]Mongodb sum all the same fields in array foreach document - Map-Reduce
我的數據庫中有這樣的文檔:
{
"first_name": "John",
"last_name": "Bolt",
"account": [
{
"cardnumber": "4844615935257045",
"cardtype": "jcb",
"currency": "CZK",
"balance": 4924.99
},
{
"cardnumber": "3552058835710041",
"cardtype": "jcb",
"currency": "BRL",
"balance": 9630.38
},
{
"cardnumber": "5108757163721629",
"cardtype": "visa-electron",
"currency": "CNY",
"balance": 6574.18
}
}
我的問題是-如何分別計算每個人的所有帳戶余額? 我應該用於此Map-Reduce或Aggregation Framework嗎?
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