Mysql 在BigQuery中查询表

背景

我有一个表，有1列“data”，其中包含BigQuery中的“JSON”，如下所示

 data    
 {"name":"x","mobile":999,"location":"abc"}
 {"name":"x1","mobile":9991,"location":"abc1"}

现在，我想使用groupby函数：

SELECT
    data
FROM
    table 
GROUP BY 
    json_extract(data,'$.location')

此查询抛出一个错误

GROUP BY中的表达式JSON_EXTRACT（[data]，“$.location”）无效

所以，我将查询修改为

SELECT
    data, json_extract(data,'$.location') as l
FROM
    table 
GROUP BY
    l

此查询引发错误

GROUP BY列表中不存在表达式“data”

查询

如何在GROUPBY子句中使用JSON字段

---

（在查询上下文中）使用JSON填充列有哪些限制。

您是按位置对某些内容进行分组，但没有对

数据

字段使用聚合函数，因此编译器不知道选择哪个或在源代码上聚合什么

为了说明示例，我编译了这个测试查询，它使用

group\u concat

：

select group_concat(data),location from
(
select * from
(SELECT '{"name":"x","mobile":999,"location":"abc"}' as data,json_extract('{"name":"x","mobile":999,"location":"abc"}','$.location') as location),
(SELECT '{"name":"x","mobile":111,"location":"abc"}' as data,json_extract('{"name":"x","mobile":111,"location":"abc"}','$.location') as location),
(SELECT '{"name":"x1","mobile":9991,"location":"abc1"}' as data,json_extract('{"name":"x1","mobile":9991,"location":"abc1"}','$.location') as location)

) d
group by location

并返回：

+-----+---------------------------------------------------------------------------------------------------+----------+--+
| Row | f0_                                                                                               | location |  |
+-----+---------------------------------------------------------------------------------------------------+----------+--+
| 1   | {"name":"x","mobile":999,"location":"abc"},"{""name"":""x"",""mobile"":111,""location"":""abc""}" | abc      |  |
+-----+---------------------------------------------------------------------------------------------------+----------+--+
| 2   | {"name":"x1","mobile":9991,"location":"abc1"}                                                     | abc1     |  |
+-----+---------------------------------------------------------------------------------------------------+----------+--+

试试下面的方法

SELECT location,
  GROUP_CONCAT_UNQUOTED(REPLACE(data, ',"location":"' + location + '"', '')) AS data
FROM (
  SELECT data,
    JSON_EXTRACT_SCALAR(data,'$.location') AS  location,
  FROM YourTable
)
GROUP BY location  

---

好的，很好，但是如果我有大量的行，这个方法可以扩展吗？如果你说的是BigQuery，是的，甚至可以运行PB级的快速操作。内部选择是运行静态查询而没有表的纯粹示例。但是您的数据在一个表中，所以您只能查询它。不清楚-您希望得到什么结果？您能提供输出中“聚合”行的示例吗？