Indexing and querying JSON array - sql-server

Question

I have JSON values like this stored in a table:
{
"properties":[
{
"address":{
"value":"A3",
"name":"",
"prop":"",
"path":[
"RealOptionsList9293"
],
"type":"local"
},
"value":{
"type":11,
"value":"portland"
},
"dependents":[
],
"save":true
}
]
}
I'd like to index on address.value and value.value so that I can query on them. MSDN examples are for basic property using computed column. It does not cover indexing an array. Is indexing possible on array? Any example will be helpful.
I'd like to query for rows with:
JSON_VALUE(mycolumn, '$.properties[*].address.value') = 'A3'
AND JSON_VALUE(mycolumn, $.properties[*].value.value) = 'portland'
I don't see [*] syntax. Should I use OPENJSON() instead? If I use it, should I use a materialized view?

Answer 1

If you want to query a JSON array, OPENJSON() is more appropriate:
Table:
CREATE TABLE #Data (
JsonData nvarchar(max)
)
INSERT INTo #Data (JsonData)
VALUES (N'{
"properties":[
{
"address":{
"value":"A3",
"name":"",
"prop":"",
"path":[
"RealOptionsList9293"
],
"type":"local"
},
"value":{
"type":11,
"value":"portland"
},
"dependents":[
],
"save":true
},
{
"address":{
"value":"A4",
"name":"",
"prop":"",
"path":[
"RealOptionsList9293"
],
"type":"local"
},
"value":{
"type":11,
"value":"portland"
},
"dependents":[
],
"save":true
}
]
}')
Statement:
SELECT d.*
FROM #Data d
CROSS APPLY OPENJSON(d.JsonData, '$.properties') WITH (
AddressValue nvarchar(1000) '$.address.value',
ValueValue nvarchar(1000) '$.value.value'
) j
WHERE j.AddressValue = 'A3' AND ValueValue = 'portland'

Answer 2

When you want to query JSON arrays or objects you should use JSON_QUERY which is designed to work with that. JSON_VALUE is designed to return a scalar, thus, if you use JSON_VALUE with address, value or even dependents (in your JSON), it'll always returns null. But if you use it with save, it'll return its value.
So, what you need to do is something like this :
SELECT
JSON_VALUE([Address],'$.value')
FROM (
SELECT
JSON_QUERY(#json,'$.properties[0].address') AS [Address]
, JSON_QUERY(#json,'$.properties[0].value') AS [Value]
, JSON_QUERY(#json,'$.properties[0].dependents') AS [dependents]
) arrays