将 JSON 转换为表格 (PowerQuery)答案

【问题标题】：Converting JSON into Table (PowerQuery)将 JSON 转换为表格 (PowerQuery)
【发布时间】：2021-02-16 09:09:29
【问题描述】：

从这个 Web JSON 中提取信息到表中的正确 PowerQuery 语法是什么：我对 PowerQuery 不是很熟悉，这可能是我唯一需要它的时候，所以如果有人能在不参考文档的情况下帮助我，我将不胜感激。谢谢

[{"time_entry_group": {"minutes": 301,"time_entries_params": {"locked": "0","from": "2021-02-01","to": "2021-02-28","customer_id": "11223344","project_id": "223388","service_id": "435248"},"revenue": 57691.6666666667,"project_id": 223388,"project_name": "Scrb","service_id": 435248,"service_name": "Meetings","month": "202102"}}
, {"time_entry_group": {"minutes": 1175,"time_entries_params": {"locked": "1","from": "2021-01-01","to": "2021-01-31","customer_id": "11223344","project_id": "223388","service_id": "421393"},"revenue": 225208.333333333,"project_id": 223388,"project_name": "Scrb","service_id": 421393,"service_name": "Design","month": "202101"}}
, {"time_entry_group": {"minutes": 24,"time_entries_params": {"locked": "1","from": "2021-01-01","to": "2021-01-31","customer_id": "11223344","project_id": "3168911","service_id": "95033"},"revenue": 4600.0,"project_id": 3168911,"project_name": "youkn Dev","service_id": 95033,"service_name": "Reviews","month": "202101"}}]

【问题讨论】：

标签： powerbi powerquery

【解决方案1】：

为了将来参考，如果您有需要展开的列，您可以改为单击列名称右侧的此箭头图标。单击它应显示一个菜单，然后该菜单应允许您指定要扩展或到达的嵌套列。需要明确的是，它将为该表中的所有行扩展该列，而不仅仅是一个。

您包含的 JSON 基本上是一个对象数组，因此可以使用：

Json.Document 解析 JSON，它应该会给你一个记录列表
Table.FromRecords 将记录列表转换为表格。
Table.ExpandRecordColumn 展开嵌套记录列。

示例实现：

let
    json = "[{""time_entry_group"":{""minutes"":301,""time_entries_params"":{""locked"":""0"",""from"":""2021-02-01"",""to"":""2021-02-28"",""customer_id"":""11223344"",""project_id"":""223388"",""service_id"":""435248""},""revenue"":57691.6666666667,""project_id"":223388,""project_name"":""Scrb"",""service_id"":435248,""service_name"":""Meetings"",""month"":""202102""}},{""time_entry_group"":{""minutes"":1175,""time_entries_params"":{""locked"":""1"",""from"":""2021-01-01"",""to"":""2021-01-31"",""customer_id"":""11223344"",""project_id"":""223388"",""service_id"":""421393""},""revenue"":225208.333333333,""project_id"":223388,""project_name"":""Scrb"",""service_id"":421393,""service_name"":""Design"",""month"":""202101""}},{""time_entry_group"":{""minutes"":24,""time_entries_params"":{""locked"":""1"",""from"":""2021-01-01"",""to"":""2021-01-31"",""customer_id"":""11223344"",""project_id"":""3168911"",""service_id"":""95033""},""revenue"":4600,""project_id"":3168911,""project_name"":""youkn Dev"",""service_id"":95033,""service_name"":""Reviews"",""month"":""202101""}}]",
    parsed = Json.Document(json),
    initialTable = Table.FromRecords(List.Transform(parsed, each [time_entry_group])),
    expanded = Table.ExpandRecordColumn(initialTable, "time_entries_params", {"locked", "from", "to", "customer_id"})
in
    expanded

关于上述代码的一件事是它不会扩展嵌套字段project_id 和service_id（存在于time_entries_params 中）。这是因为这些列已经存在于表中（并且列名重复会导致错误）。我假设这不是问题，因为嵌套值没有什么不同。

【讨论】：

恐怕这是我缺少的部分。我有一个产生 3 条记录的查询，我可以单击（向下钻取）这些记录，每次向下钻取时，我都会获得一个新的应用步骤，但仅限于一条记录。但是如何让所有东西（两个杠杆）都显示为 2D 表格？我完全是这方面的初学者。
@Mara，已编辑我的答案，以提供扩展嵌套列的示例。
完美，你拯救了我的一天！