Oracle - Parsing Multiple JSON Values in a single SQL query - sql

Question

I have data in PersonalDetails table in JSON format, I am trying to parse the data in a single query, currently I am using JSON_TABLE functions, in my query I am only able to parse only one column, if I try to use JSON_TABLE functions twice it throwing me an error, is their a way to parse all the columns in a single query? or is their any other function apart from JSON_TABLE?
Sample Data
{
"FirstName" : "John",
"LastName" : "Doe",
"Job" : "Clerk",
"Address" : {
"Street" : "99 My Street",
"City" : "My City",
"Country" : "UK",
"Postcode" : "A12 34B"
},
"ContactDetails" : {
"Email" : "john.doe#example.com",
"Phone" : "44 123 123456",
"Twitter" : "#johndoe"
},
"DateOfBirth" : "01-JAN-1980",
"Active" : true
}
My Query
SELECT
FirstName,
LastName,
Job,
Street,
City,
Country,
Postcode,
ContactDetails,
DateOfBirth,
Active
FROM
JSON_TABLE(tab.Address, '$' COLUMNS
( Address VARCHAR(255) PATH '$.Street',
City VARCHAR(255) PATH '$.City',
Country VARCHAR(255) PATH '$.Country',
Postcode VARCHAR(255) PATH '$.Postcode',
)) JT,
PersonalDetails tab;

Answer 1

with PersonalDetails (jsn) as (
select '{
"FirstName" : "John",
"LastName" : "Doe",
"Job" : "Clerk",
"Address" : {
"Street" : "99 My Street",
"City" : "My City",
"Country" : "UK",
"Postcode" : "A12 34B"
},
"ContactDetails" : {
"Email" : "john.doe#example.com",
"Phone" : "44 123 123456",
"Twitter" : "#johndoe"
},
"DateOfBirth" : "01-JAN-1980",
"Active" : true
}' from dual
)
select jt.* from PersonalDetails, json_table (
PersonalDetails.jsn, '$'
COLUMNS
Firstname VARCHAR2(30) PATH '$.FirstName',
Address VARCHAR2(255) PATH '$.Address.Street',
City VARCHAR2(255) PATH '$.Address.City',
Country VARCHAR2(255) PATH '$.Address.Country',
Postcode VARCHAR2(255) PATH '$.Address.Postcode',
dob VARCHAR2(11) PATH '$.DateOfBirth',
email VARCHAR2(50) PATH '$.ContactDetails.Email'
) jt;

Answer 2

You could use the NESTED clause:
with PersonalDetails (data) as (
select
'{
"FirstName" : "John",
"LastName" : "Doe",
"Job" : "Clerk",
"Address" : {
"Street" : "99 My Street",
"City" : "My City",
"Country" : "UK",
"Postcode" : "A12 34B"
},
"ContactDetails" : {
"Email" : "john.doe#example.com",
"Phone" : "44 123 123456",
"Twitter" : "#johndoe"
},
"DateOfBirth" : "01-JAN-1980",
"Active" : true
}'
from dual
)
SELECT jt.*
FROM PersonalDetails,
JSON_TABLE(data, '$'
COLUMNS (FirstName VARCHAR2(50), LastName VARCHAR2(50), Job, Active,
NESTED ContactDetails COLUMNS (Email VARCHAR2(100), Phone)
)
) jt;
Output:
FIRSTNAME LASTNAME JOB ACTIVE EMAIL PHONE
---------- -------- ----- ------ -------------------- ---------------
John Doe Clerk true john.doe#example.com 44 123 123456