给定以下数据模型：
{
"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
}
]
}
如何查询customerId的积分总数？即：
{
{
"customerId": "a",
"total": "20
},
{
"customerId": "b",
"total": "10
}
}
每个文档聚合使用SUBQUERY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 ...........;
对于整个查询
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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