压扁并重建JSON Snowflake

Question

我仍在学习Snowflake，如有任何帮助，我们将不胜感激。

我有一个专栏，我们称之为"结果"。

{
"catalog": [
{
"img_href": "https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179361.jpg",
"name": "ADITI HAND BLOCKED PRINT",
"price": 16
},
{
"img_href": "https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179330.jpg",
"name": "TORBAY HAND BLOCKED PRINT",
"price": 17
},
{
"img_href": "https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179362.jpg",
"name": "ADITI HAND BLOCKED PRINT",
"price": 18
}
],
"datetime": 161878993658
"catalog_id": 1
}

我想把它压平并重建为下面的

[
{
"datetime": 161878993658,
"url": "https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179361.jpg"
},
{
"datetime": 161878993658,
"url": "https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179330.jpg"
},
{
"datetime": 161878993658,
"url": "https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179362.jpg"
},
]

Answer 1

下面将执行此操作。您不需要CTE，所以删除它，并将tbl的使用替换为表的名称，将json的使用替换成变体列。

/*delete this line*/ with tbl as (select parse_json($1) json from values('{"catalog":[{"img_href":"https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179361.jpg","name":"ADITI HAND BLOCKED PRINT","price":16},{"img_href":"https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179330.jpg","name":"TORBAY HAND BLOCKED PRINT","price":17},{"img_href":"https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179362.jpg","name":"ADITI HAND BLOCKED PRINT","price":18}],"datetime":161878993658,"catalog_id":1}'))
select array_agg(new_col) reconstructed
from (
/* replace json and tbl */ select object_construct('datetime', json:datetime, 'url', obj.value:img_href) new_col, json:catalog_id catalog_id
from tbl, lateral flatten(json:catalog) obj
) group by catalog_id;

输出

[
{
"datetime": 161878993658,
"url": "https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179361.jpg"
},
{
"datetime": 161878993658,
"url": "https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179330.jpg"
},
{
"datetime": 161878993658,
"url": "https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179362.jpg"
}
]