Querying JSON nested array object in SQL

Question

I have the following JSON and i need to query only the name property values.

DECLARE @j NVARCHAR(4000) = N'{  
   "ArrayValue":[
        {
            "name": "XXX",
            "value": 10
        },
        {
            "name": "Memory123",
            "value": 20
        }
    ]
}'

Following is what i get with OPENJSON()

SELECT value as Name
FROM OPENJSON(@j, '$.ArrayValue')

Whcih will get the following output.

Name
---------------------------------------------------
{              "name": "Memory"          }
{              "name": "Memory123"          }

However I need the output in the following format.

Name
-----
Memory
Memory123

Is there any simpler way without using replace?

digital.aaron · Accepted Answer · 2017-11-17 22:12:59Z

2

You can define ArrayValue as a JSON column, then use CROSS APPLY to get the name values. Here's an example:

DECLARE @j NVARCHAR(4000) = N'{  
   "ArrayValue":[
        {
            "name": "XXX",
            "value": 10
        },
        {
            "name": "Memory123",
            "value": 20
        }
    ]
}'
SELECT b.name
FROM OPENJSON(@j)
WITH (ArrayValue NVARCHAR(MAX) AS JSON) AS a
CROSS APPLY OPENJSON(a.ArrayValue)
WITH ([name] NVARCHAR(100)) AS b

answered Nov 17, 2017 at 22:12

digital.aaron

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