How to parse nested Json in SQL Server - json

Question

I retrieved JSON from an API (part of json file was showed at the bottom). I was hoping to parse the json and store in SQL table. With the following SQL query, there was only 1 row returned. How can I return all rows with table headers NAME JobNum Water Sewer ? I tried while loop using variable to replace [0] after $.items, but seemed not to work. I wasn't sure if the structure of json file works for cross apply.
DECLARE #MondayComApi VARCHAR(MAX)
SELECT #MondayComApi = BULKCOLUMN
FROM OPENROWSET(BULK'D:/temp/a.json', SINGLE_BLOB) JSON
IF (ISJSON(#MondayComApi) = 1)
BEGIN
PRINT 'JSON File is valid';
SELECT NAME, JobNum, Water, Sewer
FROM OPENJSON(#MondayComApi, '$.data.boards')
WITH (
NAME VARCHAR(100) '$.items[0].name',
JobNum VARCHAR(100) '$.items[0].column_values[0].text',
Water VARCHAR(100) '$.items[0].column_values[1].text',
Sewer VARCHAR(100) '$.items[0].column_values[2].text'
)
END
ELSE
BEGIN
PRINT 'JSON File is invalid';
END
The following was part of the JSON - I reduced content of "items" to shorten length:
{
"data": {
"boards": [
{
"items": [
{
"name": "Holmes Project",
"column_values": [
{
"title": "Job",
"text": "D1210"
},
{
"title": "Water",
"text": "YES"
},
{
"title": "Sewer",
"text": "YES"
}
]
},
{
"name": "Lake Short Project)",
"column_values": [
{
"title": "Job",
"text": "D1014"
},
{
"title": "Water",
"text": "YES"
},
{
"title": "Sewer",
"text": "YES"
}
]
},
{
"name": "Chase Project",
"column_values": [
{
"title": "Job",
"text": "D2101"
},
{
"title": "Water",
"text": "NO"
},
{
"title": "Sewer",
"text": "YES"
}
]
},
{
"name": "Juanita Project",
"column_values": [
{
"title": "Job",
"text": "D1102"
},
{
"title": "Water",
"text": "YES"
},
{
"title": "Sewer",
"text": "YES"
}
]
},
{
"name": "Lowry Project",
"column_values": [
{
"title": "Job",
"text": "D1014"
},
{
"title": "Water",
"text": "YES"
},
{
"title": "Sewer",
"text": "YES"
}
]
}
]
}
]
},
"account_id": 5687438790
}

Answer 1

I moved more of the JSON path out of WITH and into OPENJSON:
SELECT NAME, JobNum, Water, Sewer
FROM
OPENJSON(#MondayComApi, '$.data.boards[0].items')
WITH (
NAME VARCHAR(100) '$.name',
JobNum VARCHAR(100) '$.column_values[0].text',
Water VARCHAR(100) '$.column_values[1].text',
Sewer VARCHAR(100) '$.column_values[2].text'
)

Answer 2

Firstly, SINGLE_BLOB should be SINGLE_CLOB if it is ANSI or UTF-8 data.
Next, to break out a JSON array into separate rows, you need OPENJSON without a schema, then you use OPENJSON again on each row, where key column contains the index, and value contains the object.
If boards always contains only one object in its array, you can remove the second OPENJSON and change the path of the first to $.data.boards[0].items
Then we can break out the column_values and pivot them back up into a single row.
SELECT
NAME = JSON_VALUE(item.value, '$.name'),
cv.JobNum,
cv.Water,
cv.Sewer
FROM OPENJSON(#j, '$.data.boards') boards
CROSS APPLY OPENJSON(boards.value, '$.items') item
CROSS APPLY (
SELECT
MIN(CASE WHEN title = 'Job' THEN [text] END) JobNum,
MIN(CASE WHEN title = 'Water' THEN [text] END) Water,
MIN(CASE WHEN title = 'Sewer' THEN [text] END) Sewer
FROM OPENJSON(item.value, '$.column_values')
WITH (
title varchar(100),
[text] varchar(100)
) column_values
) cv