How to get the inner elements of JsonB column in Postgres - sql

Question

I have a Json like this in my JsonB column:
{
"emails": [
{
"email": {
"id": "a8399412-165e-4601-824f-a55f631ad471",
"value": "test#gmail.com"
}
},
{
"email": {
"id": "fa09d9a7-a36a-42a4-8627-66b7554ce82e",
"value": "test1#gmail.com"
}
}
],
"Address": [
{
"address": {
"id": "a8399412-165e-4601-824f-a55f631ad471",
"addressLine1": "Line1"
}
},
{
"address": {
"id": "fa09d9a7-a36a-42a4-8627-66b7554ce82e",
"addressLine2": "Line2"
}
}
],
"lastName": {
"id": "bc10a5a9-04ff-4a00-b167-ac3232e5cb89",
"value": "LastName"
},
"firstName": {
"id": "4ccdd400-2586-4a7f-9379-aff4d1f5d9d6",
"value": "FirstName"
}
}
and so on. My requirement to get list of elements as key and value pairs with limit, I did a research tried different functions of postgres and I wrote the below query :
select response.* from my_table t, jsonb_each_text(jsonb_column) as response;
If I do like this I'm getting only the root elements like emails, firstName and lastName, but I want inner elements as well along with their values like below :
Key | value
------- ---------
"email" : {"id": "a8399412-165e-4601-824f-a55f631ad471","value": "test#gmail.com"}
"email" : {"id": "fa09d9a7-a36a-42a4-8627-66b7554ce82e","value": "test1#gmail.com"}
"lastName" : {"id": "bc10a5a9-04ff-4a00-b167-ac3232e5cb89","value": "LastName"}
"firstName" : {"id": "4ccdd400-2586-4a7f-9379-aff4d1f5d9d6","value": "FirstName"}
"address" : {"id": "a8399412-165e-4601-824f-a55f631ad471", "addressLine1": "Line1"}
"address" : {"id": "a8399412-165e-4601-824f-a55f631ad471", "addressLine2": "Line2"}

Answer 1

You can use jsonb_array_elements() function, and combine queries by UNION ALL
SELECT 'email' AS key, je.* ->> 'email' AS value
FROM my_table
CROSS JOIN jsonb_array_elements(jsonb_column->'emails') AS je
UNION ALL
SELECT 'address', ja.* ->> 'address'
FROM my_table
CROSS JOIN jsonb_array_elements(jsonb_column->'Address') AS ja
UNION ALL
SELECT 'lastName', (jsonb_column->'lastName')::text
FROM my_table
UNION ALL
SELECT 'firstName', (jsonb_column->'firstName' )::text
FROM my_table
Demo