insert json to sql table getting null - sql

Question

I have the following json , when i am trying to extract it to sql i get empty.
I need CusP.id, CusP.custldId ,cusfield.id, value
DECLARE #json NVARCHAR(MAX);
SELECT #json = '{
"includ": {
"cusP": {
"542310": {
"id": 542310,
"custldId": 155,
"cusfield": {
"id": 155,
"type": "custfi"
},
"projectId": 17435,
"project": {
"id": 17435,
"type": "projects"
},
"value": "META DATA",
"createdAt": "2022-01-16T05:11:20Z",
"createdBy": 222222
},
"21000": {
"id": 21000,
"custldId": 426,
"cusfield": {
"id": 426,
"type": "custfi"
},
"projectId": 786044,
"project": {
"id": 786044,
"type": "projects"
},
"value": "delta55",
"createdAt": "2022-01-17T10:03:07Z",
"createdBy": 333333
}
}
}
}'
This is what i am trying:
SELECT
D.cusPid,
d.[value],
c.cusfieldid,
cd.projectId
FROM OPENJSON(#json, '$.includ.cusP')
WITH (
cusPid NVARCHAR(max) '$.id',
[value] NVARCHAR(max) '$.value'
) D
CROSS APPLY OPENJSON(#json, '$.includ.cusP.custfi')
WITH (
cusfieldid VARCHAR(100) '$.id'
) C
CROSS APPLY OPENJSON(#json, '$.includ.cusP.project')
WITH (
projectId VARCHAR(100) '$.id'
) Cd;
that is the result i expect
cusPid
value
cusfieldid
projectId
542310
META DATA
155
17435
21000
delta55
426
786044

Answer 1

The problem is that the ID is also itself used as the key for a sub-property and OPENJSON does not allow variable paths (beyond arrays), so you need an extra level:
SELECT P.id AS cuspID, P.[value], P.cusfieldid, [projectId]
FROM OPENJSON(#json, '$.includ.cusP') J
CROSS APPLY OPENJSON(J.[value]) WITH (
id INT,
[value] NVARCHAR(MAX),
[projectId] INT,
cusfieldid INT '$.cusfield.id'
) P