基于以下查询
SELECT internal_transaction_id, tags FROM "bankstatements"."statements_transactions_sample_data"
我得到下表
+-----------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| internal_transaction_id | tags |
+-----------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| 2173059 | [{category=null, creditdebit=credit, lendertype=null, pending=null, pre_authorisation=null, thirdparty=null}, {category=null, creditdebit=null, lendertype=null, pending=null, pre_authorisation=null, thirdparty=Internal Transfer Credit}, {category=Internal Transfer, creditdebit=null, lendertype=null, pending=null, pre_authorisation=null, thirdparty=null}]
+-----------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| 2173061 | [{category=null, creditdebit=credit, lendertype=null, pending=null, pre_authorisation=null, thirdparty=null}, {category=null, creditdebit=null, lendertype=null, pending=null, pre_authorisation=null, thirdparty=UBER}, {category=External Transfer, creditdebit=null, lendertype=null, pending=null, pre_authorisation=null, thirdparty=null}]
+-----------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
我想取消嵌套“标签”列，保持相同的行数。目前我的查询
SELECT
internal_transaction_id, t.category, t.creditdebit, t.lendertype, t.pending, t.pre_authorisation, t.thirdparty
FROM
"bankstatements"."statements_transactions_sample_data"
CROSS JOIN UNNEST(tags) AS tag (t)
结果:
+-----------------------------+---------------------+---------------+---------------+-----------+-----------------------+---------------------------+
| internal_transaction_id | category | creditdebit | lendertype | pending | pre_authorisation | thirdparty |
+-----------------------------+---------------------+---------------+---------------+-----------+-----------------------+---------------------------+
| 2173059 | | credit | | | | |
+-----------------------------+---------------------+---------------+---------------+-----------+-----------------------+---------------------------+
| 2173059 | | | | | | Internal Transfer Credit |
+-----------------------------+---------------------+---------------+---------------+-----------+-----------------------+---------------------------+
| 2173059 | Internal Transfer | | | | | |
+-----------------------------+---------------------+---------------+---------------+-----------+-----------------------+---------------------------+
| 2173061 | | credit | | | | |
+-----------------------------+---------------------+---------------+---------------+-----------+-----------------------+---------------------------+
| 2173061 | | | | | | UBER |
+-----------------------------+---------------------+---------------+---------------+-----------+-----------------------+---------------------------+
| 2173061 | External Transfer | | | | | |
+-----------------------------+---------------------+---------------+---------------+-----------+-----------------------+---------------------------+
我想知道如何取消嵌套标签，使其只有 2 行，如下所示:
+-----------------------------+---------------------+---------------+---------------+-----------+-----------------------+---------------------------+
| internal_transaction_id | category | creditdebit | lendertype | pending | pre_authorisation | thirdparty |
+-----------------------------+---------------------+---------------+---------------+-----------+-----------------------+---------------------------+
| 2173059 | Internal Transfer | credit | | | | Internal Transfer Credit |
+-----------------------------+---------------------+---------------+---------------+-----------+-----------------------+---------------------------+
| 2173061 | External Transfer | | | | | UBER |
+-----------------------------+---------------------+---------------+---------------+-----------+-----------------------+---------------------------+
JSON 中的 tag 标签如下所示:
[
{
"thirdParty": "Other Credits"
},
{
"category": "All Other Credits"
},
{
"creditDebit": "credit"
}
]
当我定义创建时:
tags: array<
struct<
category: string,
creditdebit: string,
lendertype: string,
pending: string,
pre_authorisation: string,
thirdparty: string
>
>
最佳答案
使用最小值或最大值进行聚合:
SELECT
internal_transaction_id, max(t.category) as category, max(t.creditdebit) as creditdebit, max(t.lendertype) as lendertype, max(t.pending) as pending, max(t.pre_authorisation) as pre_authorisation, max(t.thirdparty) as thirdparty
FROM
"bankstatements"."statements_transactions_sample_data"
CROSS JOIN UNNEST(tags) AS tag (t)
GROUP BY internal_transaction_id
关于SQL:取消嵌套数组，在 aws athena 中保持相同的行数，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/66739291/