子文档中的couchbase N1QL分组依据

鉴于以下数据模型：

{
 "events": [
   {
      "customerId": "a", 
      "type": "credit" ,
      "value": 10 
   },
   {
      "customerId": "a", 
      "type": "credit" ,
      "value": 10 
   },
   {
      "customerId": "b", 
      "type": "credit" ,
      "value": 5 
   },
   {
      "customerId": "b", 
      "type": "credit" ,
      "value": 5 
   }
 ]
}

如何按customerId查询积分的总和？i、 e:

{
  {
   "customerId": "a",
   "total": "20
  },
  {
   "customerId": "b",
   "total": "10
  }
}

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每个文档聚合使用子查询表达式

SELECT d.*, 
    (SELECT e.customerId, SUM(e.`value`) AS total
     FROM d.events AS e
     WHERE ......
     GROUP BY e.customerId) AS events
FROM default AS d
WHERE ...........;

用于整个查询

SELECT e.customerId, SUM(e.`value`) AS total
FROM default AS d
UNNEST d.events AS e
WHERE ......
GROUP BY e.customerId;

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我假设你有不止一个这样的文档。您是希望在每个文档中聚合，还是希望在所有文档中聚合？@MatthewGroves是的，有多个此类文档，在文档级别聚合就可以了。vsr的答案是有效的。