Transform Json Nested Object Array To Table Row - sql

Question

I have a json like:
[
{
"Id": "1234",
"stockDetail": [
{
"Number": "10022_1",
"Code": "500"
},
{
"Number": "10022_1",
"Code": "600"
}
]
},
{
"Id": "1235",
"stockDetail": [
{
"Number": "10023_1",
"Code": "100"
},
{
"Number": "10023_1",
"Code": "100"
}
]
}
]
How to convert it in sql table like below:
+------+---------+------+
| Id | Number | Code |
+------+---------+------+
| 1234 | 10022_1 | 500 |
| 1234 | 10022_1 | 600 |
| 1235 | 10023_1 | 100 |
| 1235 | 10023_1 | 100 |
+------+---------+------+

Answer 1

If you need to define typed columns you can use OPENJSON with WITH clause:
DECLARE #j nvarchar(max) = N'[
{
"Id": "1234",
"stockDetail": [
{ "Number": "10022_1",
"Code": "500"
},
{ "Number": "10022_1",
"Code": "600"
}
]
},
{
"Id": "1235",
"stockDetail": [
{ "Number": "10023_1",
"Code": "100"
},
{ "Number": "10023_1",
"Code": "100"
}
]
}
]'
select father.Id, child.Number, child.Code
from openjson (#j)
with (
Id int,
stockDetail nvarchar(max) as json
) as father
cross apply openjson (father.stockDetail)
with (
Number nvarchar(100),
Code nvarchar(100)
) as child
Result:

Answer 2

In your case you may try to CROSS APPLY the JSON child node with the parent node:
DECLARE #json nvarchar(max)
SET #json = N'
[
{
"Id": "1234",
"stockDetail": [
{
"Number": "10022_1",
"Code": "500"
},
{
"Number": "10022_1",
"Code": "600"
}
]
},
{
"Id": "1235",
"stockDetail": [
{
"Number": "10023_1",
"Code": "100"
},
{
"Number": "10023_1",
"Code": "100"
}
]
}
]'
SELECT
JSON_Value (i.value, '$.Id') as ID,
JSON_Value (d.value, '$.Number') as [Number],
JSON_Value (d.value, '$.Code') as [Code]
FROM OPENJSON (#json, '$') as i
CROSS APPLY OPENJSON (i.value, '$.stockDetail') as d
Output:
ID Number Code
1234 10022_1 500
1234 10022_1 600
1235 10023_1 100
1235 10023_1 100