在PostgreSQL中创建嵌套的json blob

我试图从如下表中创建嵌套json：

+----------+---------+------------------------------+
| unixtime | assetid |             data             |
+----------+---------+------------------------------+
|       10 |      80 | {"inflow": 10, "outflow": 2} |
|       20 |      90 | {"inflow": 10, "outflow": 2} |
|       10 |      80 | {"inflow": 10, "outflow": 2} |
|       20 |      90 | {"inflow": 10, "outflow": 2} |
+----------+---------+------------------------------+

{
    "10": {
        "80": {"inflow": 10, "outflow": 2},
        "90": {"inflow": 10, "outflow": 2}
    },
    "20": {
        "80": {"inflow": 10, "outflow": 2},
        "90": {"inflow": 10, "outflow": 2}
    }
}

然后得到这样的结果：

+----------+---------+------------------------------+
| unixtime | assetid |             data             |
+----------+---------+------------------------------+
|       10 |      80 | {"inflow": 10, "outflow": 2} |
|       20 |      90 | {"inflow": 10, "outflow": 2} |
|       10 |      80 | {"inflow": 10, "outflow": 2} |
|       20 |      90 | {"inflow": 10, "outflow": 2} |
+----------+---------+------------------------------+

{
    "10": {
        "80": {"inflow": 10, "outflow": 2},
        "90": {"inflow": 10, "outflow": 2}
    },
    "20": {
        "80": {"inflow": 10, "outflow": 2},
        "90": {"inflow": 10, "outflow": 2}
    }
}

我尝试过递归地将json数据转换为文本，然后使用json对象将结果转换为json blob，但最终用转义斜杠（\）将json结构搞砸了

任何帮助都将不胜感激

以下是数据链接：

---

谢谢。

您可以使用

json\u object\u agg（）

函数：

....
, m as (
select
    unixdatetime,
    assetid,
    json_object(array_agg(description), array_agg(value::text))
    as value
from input_data
group by unixdatetime, assetid
), j as
(
select json_object_agg("assetid","value") as js,m."unixdatetime"
  from m
 group by "unixdatetime" 
)
select json_object_agg("unixdatetime",js)
  from j

---

谢谢真不敢相信我花了两个小时在这上面。这看起来比json_对象和数组agg更干净、更快，不是吗？