sql MS SQL OPENJSON

Posted 2021-05-13

-- Json Collection to Row Set (TYPE 1)
DECLARE @json NVARCHAR(MAX);
SET @json
    = N'[  
    { 
	  "id" : 6,
	  "info": { "name": "John", "surname": "Doe" }, 
	  "age": 25 
	},  
    { 
	  "id" : 25,
	  "info": { "name": "Jane", "surname": "Doe" }, 
	  "dob": "2005-11-04T12:00:00" 
	 }  
 ]';

SELECT *
FROM
    OPENJSON(@json)
    WITH
    (
        id INT 'strict $.id',
        fName NVARCHAR(50) '$.info.name',
        lName NVARCHAR(50) '$.info.surname',
        age INT,
        dob DATETIME2 '$.dob'
    );


-- OUTPUT
-- id | fName | lName | age  | dob
-- 6  | John  | Doe   | 25   | NULL
-- 5  | Jane  | Smith | NULL | 2005-11-04 12:00:00.0000000


-- Json Collection to Row Set (TYPE 2)
DECLARE @json NVARCHAR(MAX);
SET @json
    = N'[  
    { 
	  "id" : 23,
	  "info": { "name": "John", "surname": "Doe" },
	  "age": 25, 
	  "Phones": ["123","345","678"] 
	},
    {
	  "id" : 33,
	  "info": { "name": "Jane", "surname": "Doe" },
	  "dob": "2005-11-04T12:00:00", 
	  "Phones": ["321","543"] 
	}
]';

SELECT id, [name], [surname], age, dob, number
FROM
(
    SELECT *
    FROM
        OPENJSON(@json)
        WITH
        (
            id INT 'strict $.id',
            [name] NVARCHAR(50) '$.info.name',
            [surname] NVARCHAR(50) '$.info.surname',
            age INT,
            dob DATETIME2 '$.dob',
            Phones NVARCHAR(MAX) AS JSON
        )
) AS people
    OUTER APPLY
    OPENJSON(Phones)
    WITH
    (
        number NVARCHAR(50) '$'
    );

-- OUTPUT
--  id | name | surname | age |    dob |                       number
--  2  	 John   Smith     25	   NULL                       	123
--  2	 John	Smith	  25	   NULL	                        345
--  2	 John	Smith	  25	   NULL	                        678
--  3	 Jane	Smith	  NULL   2005-11-04 12:00:00.0000000	321
--  3	 Jane	Smith	  NULL   2005-11-04 12:00:00.0000000	543