在 Snowflake 中查询列表

Question

我在 Snowflake

中有一个像下面这样的 table

+---------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|attrs          |options                                                                                                                                                                                                                                                                                            |
+---------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|acct           |[{"key":"spencer","val":"spencer"},{"key":"mart","val":"mart"},{"key":"red-fin","val":"-"}]                                                                                                                                                                                                        |
|fav_activity   |[{"key":"movie","val":"movie"},{"key":"books","val":"books"},{"key":"music","val":"music"},{"key":"swimming","val":"swimming"},{"key":"games","val":"games"},{"key":"team","val":"team"},{"key":"food","val":"food"},{"key":"steam-room","val":"\"steam room\""},{"key":"hiking","val":"hiking"}]  |
+---------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

现在我需要比较字典列表中的每个键和 val 以及 return 字典中唯一 key/val 不同的键。

例如，查看属性 acct - 列表中有 3 个词典。前两个字典的键和值相同，但第三个字典具有不同的 key/val 值。所以我需要 return 第三个字典的键 red-fin

预期输出：

+---------------+------------+
|attrs          |result      |
+---------------+------------+   
|acct           |red-fin     |
|fav_activity   |steam-room  |
+---------------+------------+  

谁能帮我在 Snowflake 中做这个。

提前致谢。

Answer 1

你只需要展平比较即可。

这解决了示例测试用例：

with data as (
select  attrs, parse_json() options   
from values ('acct', '[{"key":"spencer","val":"spencer"},{"key":"mart","val":"mart"},{"key":"red-fin","val":"-"}]')
, ('fav_activity', '[{"key":"movie","val":"movie"},{"key":"books","val":"books"},{"key":"music","val":"music"},{"key":"swimming","val":"swimming"},{"key":"games","val":"games"},{"key":"team","val":"team"},{"key":"food","val":"food"},{"key":"steam-room","val":"\"steam room\""},{"key":"hiking","val":"hiking"}]')
)

select attrs, k.value:key
from data, table(flatten(options)) k
where k.value:key!=k.value:val
;