Extract a JSON array items to a single column separated with comma - sql

Question

Struggling to find an answer to the below JSON problem. I would like to display the entire SKU/Quantity list in the "shipmentItems" array to their respective column with a comma-separated value. My example below only allows me to display the first SKU/quantity from the array but, my goal is to get all listed in the columns with comma-separated.
JSON example:
{"shipments": [
{
"shipmentId": 100003768,
"orderNumber": "9648219086",
"shipDate": "2021-10-28",
"serviceCode": "ups_ground",
"shipmentItems": [
{
"orderItemId": 1464643208,
"lineItemKey": "10322938560608",
"sku": "SCPXTSS-BAG-06",
"name": "SCOOP-PLATE-06 (1000ml)",
"weight": {
"value": 0,
"units": "ounces",
"WeightUnits": 1
},
"quantity": 1,
"unitPrice": 0,
"taxAmount": null
},
{
"orderItemId": 1464643207,
"lineItemKey": "10322938527840",
"sku": "SCPZRTS-TRAY-01",
"name": "Beef: Tray 3 (Fill 004)<br>",
"weight": {
"value": 60,
"units": "ounces",
"WeightUnits": 1
},
"quantity": 1,
"unitPrice": 102.72,
"taxAmount": null
}
],
"labelData": null,
"formData": null
}
]
}
SQL query I'm using:
DECLARE #JSON varchar(max)
SELECT #JSON = BulkColumn
FROM OPENROWSET (BULK 'C:\Users\XPS-LT\json\today\shipments_20211031.json', SINGLE_CLOB)
IMPORT
SELECT *
FROM OPENJSON (#JSON, '$.shipments')
WITH
(
[shipmentId] bigint,
[orderNumber] nvarchar(60),
[shipDate] date,
[serviceCode] nvarchar(30),
[sku] nvarchar(MAX) N'$.shipmentItems[0].sku',
[quantity] int N'$.shipmentItems[0].quantity'
)
;

Answer 1

The "shipmentItems" part of the input JSON is an array, so you need an AS JSON clause in the first explicit schema and an additional OPENJSON() call:
DECLARE #json nvarchar(max)
...
SELECT
j.[shipmentId], j.[orderNumber], j.[shipDate], j.[serviceCode],
a.[sku], a.[quantity]
FROM OPENJSON (#json, '$.shipments') WITH (
[shipmentId] bigint,
[orderNumber] nvarchar(60),
[shipDate] date,
[serviceCode] nvarchar(30),
[shipmentItems] nvarchar(max) AS JSON
) j
OUTER APPLY (
SELECT
STRING_AGG([sku], ',') WITHIN GROUP (ORDER BY [orderItemId]),
STRING_AGG([quantity], ',') WITHIN GROUP (ORDER BY [orderItemId])
FROM OPENJSON (j.shipmentItems) WITH (
[orderItemId] int '$.orderItemId',
[sku] nvarchar(max) '$.sku',
[quantity] int N'$.quantity'
)
) a ([sku], [quantity])
Result:
shipmentId orderNumber shipDate serviceCode sku quantity
100003768 9648219086 2021-10-28 ups_ground SCPZRTS-TRAY-01,SCPXTSS-BAG-06 1,1