如何在ArangoDB中计算模式？

Question

我有这样的交易

{"cust_id": "593ec", "recorded": "2015-10-15T11:22:22", "account_id": 1, "account_status": "P"},
{"cust_id": "593ec", "recorded": "2016-03-06T02:00:11", "account_id": 2, "account_status": "A"}, ...

我想总结一下有多少个唯一客户，每个客户有多少个唯一帐户，以及按频率显示帐户状态的模式值？

预期结果：

[
   {"cust_id": "593ec", "accounts": 11, "status_q1": "A", "status_q2": "N"},
   {"cust_id": "114sd", "accounts": 0,  "status_q1": "P", "status_q2": "P"},
   .....
]

谢谢

Answer 1

您可以使用COLLECT按cust_id对文档进行分组。

假设您的交易集合称为transactions ，

此查询：

FOR t IN transactions
  COLLECT c = t.cust_id INTO status = t.account_status
  RETURN {cust_id: c, accounts : LENGTH(status), status}

给您以下结果：

[
  {"cust_id": "593ec", "accounts": 2, "status": ["P","A"]},
  ...
]