Retrieve values in a list in JSON using TSQL - sql

Question

I have this JSON and I want to get all the values in keyPhrases to be displayed as a column in TSQL query. Do you know how it can be done?
Desired Output:
ID
keyPhrases
778124772
banker, good position, friends family
JSON:
{"documents": [{"id": "778124772", "keyPhrases": ["banker", "good position", "friends", "family" ], "warnings": []}]}
Really appreciate your help.

Answer 1

The OPENJSON can help you, so the potential solution can be:
DECLARE #json NVARCHAR(MAX) = '{"documents": [{"id": "778124772", "keyPhrases": ["banker", "good position", "friends", "family" ], "warnings": []}]}';
SELECT
R.id as ID,
(SELECT STRING_AGG(value, ', ') FROM OPENJSON(R.kp)) as keyPhrases
FROM OPENJSON(#json, '$.documents')
WITH (id bigint, kp nvarchar(max) '$.keyPhrases' as JSON) R
Just to know, OPENJSON and STRING_AGG are features related to newer versions of SQL Server.

Answer 2

You can use OPENJSON() and STRING_AGG() as the following:
DECLARE #JSON NVARCHAR(MAX) = N'{"documents": [{"id": "778124772", "keyPhrases": ["banker", "good position", "friends", "family" ], "warnings": []}]}';
SELECT JSON_VALUE(T.Value, '$.id') AS ID,
STRING_AGG(TT.Value, ',') AS keyPhrases
FROM OPENJSON(#JSON, '$.documents') AS T
CROSS APPLY OPENJSON(Value, '$.keyPhrases') AS TT
GROUP BY JSON_VALUE(T.Value, '$.id');
Here is a db<>fiddle