Extracting the values of a nested array in JSON using SQL Server - sql

Question

I'm trying to extract the values of a nested array inside JSON in SQL Server but not sure how. I know how to extract JSON items and also how to extract arrays but haven't been able to get the nested array out values. I found one example that supposedly shows how to do this but haven't been able to get it to work.
Here's an example: The following JSON falls under a field called json_data. There is an array under 'order', called 'line_items'. Each item in 'line_items' has multiple fields: 'quantity', 'name', 'total_money', etc.
Extracting the top level variables: 'order', 'id' is easy. But not sure how to go about extracting all the variables under the array 'line_items': specifically, 'quantity', 'name', 'total_money'. I would be grateful for any help. Many thanks!
{'order': {'location_id': 'NYC',
'id': '123',
'source': {'name': 'Kurtz'},
'line_items': [{'quantity': '1',
'name': 'Item1',
'note': 'No notes',
'base_price_money': {'amount': 1000, 'currency': 'USD'},
'total_discount_money': {'amount': 0, 'currency': 'USD'},
'total_money': {'amount': 1000, 'currency': 'USD'}},
{'quantity': '1',
'name': 'Item2',
'note': '',
'base_price_money': {'amount': 400, 'currency': 'USD'},
'gross_sales_money': {'amount': 400, 'currency': 'USD'},
'total_tax_money': {'amount': 0, 'currency': 'USD'},
'total_discount_money': {'amount': 0, 'currency': 'USD'},
'total_money': {'amount': 400, 'currency': 'USD'}}],
'total_money': {'amount': 1400, 'currency': 'USD'},
'total_tax_money': {'amount': 0, 'currency': 'USD'},
'total_discount_money': {'amount': 0, 'currency': 'USD'}},
'location': {'name': 'Breakfast Club',
'address': 'Buena Vista road',
'phone': '555-555-5155'}}

Answer 1

Assuming that you have SQL Server 2016 or later.
SQL
DECLARE #json NVARCHAR(MAX) =
N'{
"order": {
"location_id": "NYC",
"id": "123",
"source": {
"name": "Kurtz"
},
"line_items": [
{
"quantity": "1",
"name": "Item1",
"note": "No notes",
"base_price_money": {
"amount": 1000,
"currency": "USD"
},
"total_discount_money": {
"amount": 0,
"currency": "USD"
},
"total_money": {
"amount": 1000,
"currency": "USD"
}
},
{
"quantity": "1",
"name": "Item2",
"note": "",
"base_price_money": {
"amount": 400,
"currency": "USD"
},
"gross_sales_money": {
"amount": 400,
"currency": "USD"
},
"total_tax_money": {
"amount": 0,
"currency": "USD"
},
"total_discount_money": {
"amount": 0,
"currency": "USD"
},
"total_money": {
"amount": 400,
"currency": "USD"
}
}
],
"total_money": {
"amount": 1400,
"currency": "USD"
},
"total_tax_money": {
"amount": 0,
"currency": "USD"
},
"total_discount_money": {
"amount": 0,
"currency": "USD"
}
},
"location": {
"name": "Breakfast Club",
"address": "Buena Vista road",
"phone": "555-555-5155"
}
}';
--SELECT ISJSON(#json);
SELECT --parent.*
parent.id, parent.[location_id], parent.[source]
, child.*
FROM OPENJSON(#json, '$.order')
WITH
(
id INT '$.id',
[location_id] VARCHAR(30) '$.location_id',
[source] VARCHAR(30) '$.source.name',
[line_items] NVARCHAR(MAX) AS JSON
)
AS parent
CROSS APPLY OPENJSON(parent.[line_items])
WITH
(
quantity INT '$.quantity',
[name] VARCHAR(50) '$.name',
[note] VARCHAR(50) '$.note',
[base_price_money.amount] VARCHAR(50) '$.base_price_money.amount',
[base_price_money.currency] VARCHAR(50) '$.base_price_money.currency'
) AS child;
Output
+-----+-------------+--------+----------+-------+----------+-------------------------+---------------------------+
| id | location_id | source | quantity | name | note | base_price_money.amount | base_price_money.currency |
+-----+-------------+--------+----------+-------+----------+-------------------------+---------------------------+
| 123 | NYC | Kurtz | 1 | Item1 | No notes | 1000 | USD |
| 123 | NYC | Kurtz | 1 | Item2 | | 400 | USD |
+-----+-------------+--------+----------+-------+----------+-------------------------+---------------------------+

Answer 2

…
declare #j nvarchar(max) = N'{"order": {"location_id": "NYC",
"id": "123",
"source": {"name": "Kurtz"},
"line_items": [{"quantity": "1",
"name": "Item1",
"note": "No notes",
"base_price_money": {"amount": 1000, "currency": "USD"},
"total_discount_money": {"amount": 0, "currency": "USD"},
"total_money": {"amount": 1000, "currency": "USD"}},
{"quantity": "2",
"name": "Item2",
"note": "",
"base_price_money": {"amount": 400, "currency": "USD"},
"gross_sales_money": {"amount": 400, "currency": "USD"},
"total_tax_money": {"amount": 0, "currency": "USD"},
"total_discount_money": {"amount": 0, "currency": "USD"},
"total_money": {"amount": 400, "currency": "USD"}}],
"total_money": {"amount": 1400, "currency": "USD"},
"total_tax_money": {"amount": 0, "currency": "USD"},
"total_discount_money": {"amount": 0, "currency": "USD"}},
"location": {"name": "Breakfast Club",
"address": "Buena Vista road",
"phone": "555-555-5155"}}';
select *
from openjson(#j, '$.order.line_items')
with
(
--..adjust datatypes..
quantity int,
name nvarchar(50),
note nvarchar(50),
basepriceamount money '$.base_price_money.amount',
basepricecurrency nvarchar(10) '$.base_price_money.currency',
totaldiscountamount money '$.total_discount_money.amount',
totaldiscountcurrency nvarchar(10) '$.total_discount_money.currency',
totalmoneyamount money '$.total_money.amount',
totalmoneycurrency nvarchar(10) '$.total_money.currency'
);