PostgreSQL® offers two types of data types to handle JSON data, JSON
and JSONB
, you can use the opearator ||
to concatenate two JSON objects.
NOTE: To review the differences between
JSON
andJSONB
check out the related article.
NOTE: more info is available in the PostgreSQL JSON functions documentation page
The dataset
The dataset is the following:
{
"id": 778,
"shop": "Luigis Pizza",
"name": "Edward Olson",
"phoneNumbers":
["(935)503-3765x4154","(935)12345"],
"address": "Unit 9398 Box 2056\nDPO AP 24022",
"image": null,
"pizzas": [
{
"pizzaName": "Salami",
"additionalToppings": ["🥓", "🌶️"]
},
{
"pizzaName": "Margherita",
"additionalToppings": ["🍌", "🌶️", "🍍"]
}
]
}
Check out the description of the fields
The following examples use a pizza order dataset with an order having:id
: 778shop
: “Luigis Pizza”name
: “Edward Olson”phoneNumbers
:["(935)503-3765x4154","(935)12345"]address
: “Unit 9398 Box 2056\nDPO AP 24022”image
: null- and two pizzas contained in the
pizzas
item:
[
{
"pizzaName": "Salami",
"additionalToppings": ["🥓", "🌶️"]
},
{
"pizzaName": "Margherita",
"additionalToppings": ["🍌", "🌶️", "🍍"]
}
]
If you want to reproduce the examples, check how to recreate the dataset
It can be recreated with the following script:
create table test(id serial, json_data jsonb);
insert into test(json_data) values (
'{
"id": 778,
"shop": "Luigis Pizza",
"name": "Edward Olson",
"phoneNumbers":
["(935)503-3765x4154","(935)12345"],
"address": "Unit 9398 Box 2056\nDPO AP 24022",
"image": null,
"pizzas": [
{
"pizzaName": "Salami",
"additionalToppings": ["🥓", "🌶️"]
},
{
"pizzaName": "Margherita",
"additionalToppings": ["🍌", "🌶️", "🍍"]
}
]
}');
Concatenate two JSON objects with the ||
operator
Two JSON (or JSONB) objects can be concatenated using the ||
operator. To add a note
field to the pizza order
select
json_data
|| '{"note":"leave outside"}'
as add_note
from test;
Result
add_note
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
{"id": 778, "name": "Edward Olson", "note": "leave outside", "shop": "Luigis Pizza", "image": null, "pizzas": [{"pizzaName": "Salami", "additionalToppings": ["🥓", "🌶️"]}, {"pizzaName": "Margherita", "additionalToppings": ["🍌", "🌶️", "🍍"]}], "address": "Unit 9398 Box 2056\nDPO AP 24022", "phoneNumbers": ["(935)503-3765x4154", "(935)12345"]}
(1 row)
Review all the JSON PostgreSQL use-cases listed in the main page