Is there any way to build a JSON that looks like this using SQL Server 2019? - json

Question

I have this SQL Query:
SELECT
c.customer_name as name,
c.customer_ssn as social_number,
c.telephone as telephone,
c.email as email,
u.user_name as name
FROM
Customer c
LEFT OUTER JOIN
User u ON c.id_customer = u.id_customer
WHERE
c.id_customer = 2
FOR JSON PATH
SELECT * FROM Customer WHERE ID_CUSTOMER = 2
SELECT * FROM User WHERE ID_Customer = 2
This query returns this JSON :
[
{
"name": "blablabla",
"social": "123123123",
"telephone": "91123123",
"email": "blabla#gmail.com",
"name":"blabla"
}
]
Is there any way to get a JSON that looks like this:
{
"name": "blabla",
"social_number": "123123123",
"emails": [
{
"email": "blabla#gmail.com"
},
{
"email": "blablabla#gmail.com"
}
],
"telephones": [
{
"number": "(604)6622141"
},
{
"number": "(652) 2123223"
}
],
Thank you for the help!
I'm still new to coding and StackOverflow... sorry for any mistakes!

Answer 1

You can use correlated subqueries, with FOR JSON in each one
SELECT
c.customer_name as name,
c.customer_ssn as social_number,
telephones = (
SELECT telephone
FROM telephone t
WHERE t.id_customer = c.id_customer
FOR JSON PATH
),
emails = (
SELECT email
FROM email e
WHERE e.id_customer = c.id_customer
FOR JSON PATH
),
u.user_name as name
FROM
Customer c
LEFT OUTER JOIN
User u ON c.id_customer = u.id_customer
WHERE
c.id_customer = 2
FOR JSON PATH;
You can also do this as an APPLY
SELECT
c.customer_name as name,
c.customer_ssn as social_number,
t.telephones,
e.emails,
u.user_name as name
FROM
Customer c
LEFT OUTER JOIN
User u ON c.id_customer = u.id_customer
OUTER APPLY (
SELECT telephone
FROM telephone t
WHERE t.id_customer = c.id_customer
FOR JSON PATH
) t(telephones)
OUTER APPLY (
SELECT email
FROM email e
WHERE e.id_customer = c.id_customer
FOR JSON PATH
) e(emails)
WHERE
c.id_customer = 2
FOR JSON PATH;