Question 405792 in Json Question posted in
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Snowflake, JSON_EXTRACT_PATH_TEXT select all elements attribute in an array of objects

I have this data in a json column

#mycolumn
{
  "key": "KEY",
  "elements": [
    { "name": "NAME_1" },
    { "name": "NAME_2" }
    { "name": "NAME_3" }
  ]
}

I want to select all the elements[*].name.

I have tried:

select JSON_EXTRACT_PATH_TEXT(mycolumn, 'elements[].name')
select JSON_EXTRACT_PATH_TEXT(mycolumn, 'elements[*].name')
select JSON_EXTRACT_PATH_TEXT(mycolumn, 'elements[0,1,2].name')

Nothing works.

This works:

select JSON_EXTRACT_PATH_TEXT(mycolumn, 'elements[0].name')

But this returns only the first element.name

How can I get all the names?

Tags:

2

Answers


  1. 0

    You need to use LATERAL FLATTEN, like this:

    with jdata as (
SELECT try_PARSE_JSON(column1) AS mycolumn
FROM VALUES
('{
  "key": "KEY",
  "elements": [
    { "name": "NAME_1" },
    { "name": "NAME_2" },
    { "name": "NAME_3" }
  ]
}'
)
)
select e.value:name::string
from jdata j, LATERAL FLATTEN(INPUT => mycolumn:elements) e;
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  2. 0

    Using a higher order function TRANSFORM:

    SELECT TRANSFORM(mycolumn:elements, x -> x:name) FROM t;

    Output:

    enter image description here

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