CREATE TABLE product (
id              Integer     NOT NULL,
category        text        NOT NULL,
title           text        NOT NULL,
price           money       NOT NULL
);

CREATE TABLE product_details (
id              Integer     NOT NULL,
type            text        NOT NULL,
description     text        NOT NULL
);

CREATE TABLE shipping (
id              Integer     NOT NULL,
description     text        NOT NULL,
price           money       NOT NULL
);

INSERT INTO product (id, category, title, price) VALUES (1, 'sweatshirts', 'hoodie', '$50.00');
INSERT INTO product_details (id, type, description) VALUES (1, 'color', 'red');
INSERT INTO product_details (id, type, description) VALUES (1, 'color', 'blue');
INSERT INTO product_details (id, type, description) VALUES (1, 'color', 'green');
INSERT INTO product_details (id, type, description) VALUES (1, 'size', 'small');
INSERT INTO product_details (id, type, description) VALUES (1, 'size', 'large');
INSERT INTO shipping (id, description, price) VALUES (1, 'standard box', '$17.05');

--WITH JSONB_PRETTY() FUNCTION
--build json object for "shipping" field
with shipping_data as (
  select id, json_build_object('box', description, 'cost', price) as json
  from shipping
),
--build json object for "choices" field
choices_data as (
  --build json aggregated by product 'id' column
  with details_data as (
    --build json with "type" and "description" fields - grouped by product 'id' and 'type' columns
    select id, json_build_object(type, json_agg(description)) as type_json
    from product_details
    group by id, type)
  select id, json_agg(type_json) as json
  from details_data
  group by id
)
--build final json with all fields
select product.id, 
       jsonb_pretty(json_build_object('id', product.id, 'category', category, 'title', title, 'price', price,
                         'shipping', shipping_data.json,
                         'choices', choices_data.json)::jsonb
                   ) as product_json
from product
join shipping_data on shipping_data.id = product.id
join choices_data on choices_data.id = product.id;

--without any comments and jsonb_pretty() function
with shipping_data as (
  select id, json_build_object('box', description, 'cost', price) as json
  from shipping
),
choices_data as (
  with details_data as (
    select id, json_build_object(type, json_agg(description)) as type_json
    from product_details
    group by id, type)
  select id, json_agg(type_json) as json
  from details_data
  group by id
)
select product.id, 
       json_build_object('id', product.id, 'category', category, 'title', title, 'price', price,
                         'shipping', shipping_data.json,
                         'choices', choices_data.json) as product_json
from product
join shipping_data on shipping_data.id = product.id
join choices_data on choices_data.id = product.id;

PostgreSQL online editor

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About PostgreSQL

PostgreSQL is a open source relational database system and is also knows as Postgres.

Key Features:

  • Postgres is not only free and open-source but also it is highly extensible.
  • Custom Data types and funtions from various programming languaues can be introduced and the good part is compiling entire database is not required.
  • ACID(Atomicity, Consistency, Isolation, Durability) compliant.
  • First DBMS which implemented Multi-version concurrency control (MVCC) feature.
  • It's the default database server for MacOS.
  • It supports all major operating systems like Linux, Windows, OpenBSD,FreeBSD etc.

Syntax help

1. CREATE

CREATE command is used to create a table, schema or an index.

Syntax:

         CREATE TABLE table_name (
                column1 datatype,
                column2 datatype,
                ....);

2. ALTER

ALTER command is used to add, modify or delete columns or constraints from the database table.

Syntax

ALTER TABLE Table_name ADD column_name datatype;

3. TRUNCATE:

TRUNCATE command is used to delete the data present in the table but this will not delete the table.

Syntax

TRUNCATE table table_name;

4. DROP

DROP command is used to delete the table along with its data.

Syntax

DROP TABLE table_name;

5. RENAME

RENAME command is used to rename the table name.

Syntax

ALTER TABLE table_name1 RENAME to new_table_name1;

6. INSERT

INSERT Statement is used to insert new records into the database table.

Syntax

INSERT INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, value3, ...);

7. SELECT

Select statement is used to select data from database tables.

Syntax:

SELECT column1, column2, ...
FROM table_name;

8. UPDATE

UPDATE statement is used to modify the existing values of records present in the database table.

Syntax

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

9. DELETE

DELETE statement is used to delete the existing records present in the database table.

Syntax

DELETE FROM table_name where condition;