Querying JSONB column in nested structure - postgresql

Question

I've never used JSONB columns before, so I'm struggling with a simple query.
I need to select all the value fields from this json below. The output should be: value1, value2, value3, value4, value5, value6, value7, value8
That's as far as I got, but I could not find a way to go deeper in the json.
SELECT result -> 'report' ->> 'products' AS values FROM example_table
I appreciate your help.
CREATE TABLE example_table(
id SERIAL PRIMARY KEY,
result JSONB NOT NULL);
INSERT INTO example_table(result)
VALUES('{
"report": {
"products": [
{
"productName": "Product One",
"types": [
{
"type": "Type One",
"metadata": {
"prices": [
{
"price": {
"value": "value1"
}
},
{
"price": {
"value": "value2"
}
}
]
}
},
{
"type": "Type Two",
"metadata": {
"prices": [
{
"price": {
"value": "value3"
}
},
{
"price": {
"value": "value4"
}
}
]
}
}
]
},
{
"productName": "Product Two",
"types": [
{
"type": "Type One",
"metadata": {
"prices": [
{
"price": {
"value": "value5"
}
},
{
"price": {
"value": "value6"
}
}
]
}
},
{
"type": "Type Two",
"metadata": {
"prices": [
{
"price": {
"value": "value7"
}
},
{
"price": {
"value": "value8"
}
}
]
}
}
]
}
]
}
}');

Answer 1

You should use CROSS JOIN and jsonb_array_elements functions to extract array for each element of records
Demo
select
et.id,
string_agg(ptmp.value -> 'price' ->> 'value', ',')
from
example_table et
cross join jsonb_array_elements(et.result -> 'report' -> 'products') p
cross join jsonb_array_elements (p.value -> 'types') pt
cross join jsonb_array_elements (pt.value -> 'metadata' -> 'prices') ptmp
group by et.id