在雪花中，如何从键值列表中获取某个键的所有值的列表

Question

有一个大型半结构化对象的列，其中一个部分本身就是一个键值（实际上是一个键值列表）我可以这样得到它：

t.payload:questions_and_answers

给出：

[{"answer":"yes","position":0,"question":"would you"}, 
{"answer":"because","position":1,"question":"what"}]

我想从中得到：

yes, because

有什么想法吗？

Answer 1

使用展平：

CREATE OR REPLACE TABLE t
AS
SELECT PARSE_JSON('{questions_and_answers:[{"answer":"yes","position":0,"question":"would you"}, 
{"answer":"because","position":1,"question":"what"}]}') AS payload;

查询：

SELECT s.value:answer::STRING
FROM t
,TABLE(FLATTEN (input => t.payload, PATH =>'questions_and_answers')) s;

或者如果需要单输出：

SELECT LISTAGG(s.value:answer::STRING, ', ') AS result
FROM t
,TABLE(FLATTEN (input => t.payload, PATH =>'questions_and_answers')) s;

输出：