SQL Query on Json object inside multiple JSON objects - sql

Question

I have the below Json string. I need to write a query to get the TP records. Without providing the index value, we need get the result.
{
"S": [
{
"Name": "Project1",
"SP": [
{
"ID": 1,
"Name": "Test1",
"TP": [
{
"TID": 11,
"TName": "TT1",
},
{
"TID": 12,
"TName": "TT2",
},
]
},
{
"ID": 2,
"Name": "Test2",
"TP": [
{
"TID": 13,
"TName": "TT3",
},
{
"TID": 14,
"TName": "TT4",
},
]
},
]}]}
How do I query to get the TP values.
Expected Result:
TID TName
11 TT1
12 TT2
13 TT3
14 TT4

Answer 1

You can use OPENJSON function containing WITH Clause added as many CROSS APPLY Clause as upto see all sub-arrays :
SELECT S3.TID, S3.TName
FROM tab
CROSS APPLY OPENJSON(JsonData)
WITH ( S nvarchar(max) '$.S' AS JSON) AS S0
CROSS APPLY OPENJSON (S0.S)
WITH (
SP nvarchar(max) '$.SP' AS JSON ) S1
CROSS APPLY OPENJSON (S1.SP)
WITH (
TP nvarchar(max) '$.TP' AS JSON ) S2
CROSS APPLY OPENJSON (S2.TP)
WITH (
TID nvarchar(500) '$.TID',
TName nvarchar(500) '$.TName' ) S3
Demo
Update : If the first array S is fixed to contain only one item, we can reduce one-step as
SELECT S3.TID, S3.TName
FROM tab
CROSS APPLY OPENJSON(JsonData)
WITH (
SP nvarchar(max) '$.S[0].SP' AS JSON ) S1
CROSS APPLY OPENJSON (S1.SP)
WITH (
TP nvarchar(max) '$.TP' AS JSON ) S2
CROSS APPLY OPENJSON (S2.TP)
WITH (
TID nvarchar(500) '$.TID',
TName nvarchar(500) '$.TName' ) S3
Demo