add yml and sql

Author: David Arevalo

.gitignore

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+postgres-data/*

database.env

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+POSTGRES_USER=postgres
+POSTGRES_PASSWORD=postgres
+POSTGRES_DB=test

docker-compose-postgres.yml

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+version: '3.7'
+services:
+    postgres:
+        image: postgres:9.6
+        restart: always
+        env_file:
+          - database.env
+        logging:
+          options:
+            max-size: 10m
+            max-file: "3"
+        ports:
+          - '5435:5432'
+        volumes:
+          - ./postgres-data:/var/lib/postgresql/data

sql/create_data.sql

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+set session my.number_of_sales = '2000000';
+set session my.number_of_products = '300';
+set session my.number_of_coutries = '100';
+set session my.number_of_cities = '30';
+set session my.start_date = '2019-01-01 00:00:00';
+set session my.end_date = '2020-02-01 00:00:00';
+
+--delete tables 
+DROP TABLE IF EXISTS city CASCADE;
+DROP TABLE IF EXISTS country CASCADE;
+DROP TABLE IF EXISTS product CASCADE;
+DROP TABLE IF EXISTS sale CASCADE;
+
+-- Creation of product
+CREATE TABLE IF NOT EXISTS product (
+				  product_id INT NOT NULL,
+				  name varchar(250) NOT NULL,
+				  PRIMARY KEY (product_id)
+				);
+
+				-- Creation of country
+CREATE TABLE IF NOT EXISTS country (
+				  country_id INT NOT NULL,
+				  country_name varchar(450) NOT NULL,
+				  PRIMARY KEY (country_id)
+				);
+
+				-- Creation of city
+CREATE TABLE IF NOT EXISTS city (
+				  city_id INT NOT NULL,
+				  city_name varchar(450) NOT NULL,
+				  country_id INT NOT NULL,
+				  PRIMARY KEY (city_id),
+				  CONSTRAINT fk_country
+				      FOREIGN KEY(country_id) 
+					  REFERENCES country(country_id)
+				);
+
+				-- Creation of sale
+CREATE TABLE IF NOT EXISTS sale (
+				  sale_id INT NOT NULL,
+				  amount DECIMAL(20,3) NOT NULL,
+				  date_sale TIMESTAMP,
+				  product_id INT NOT NULL,
+				  city_id INT NOT NULL,
+				  PRIMARY KEY (sale_id),
+				  CONSTRAINT fk_product
+				      FOREIGN KEY(product_id) 
+					  REFERENCES product(product_id),
+				  CONSTRAINT fk_city
+				      FOREIGN KEY(city_id) 
+					  REFERENCES city(city_id)
+					  
+				);
+
+				-- Filling of products
+INSERT INTO product
+select id, concat('Product ', id) 
+FROM GENERATE_SERIES(1, current_setting('my.number_of_products')::int) as id;
+
+-- Filling of countries
+INSERT INTO country
+select id, concat('Country ', id) 
+FROM GENERATE_SERIES(1, current_setting('my.number_of_coutries')::int) as id;
+
+-- Filling of cities
+INSERT INTO city
+select id
+	, concat('City ', id)
+	, floor(random() * (current_setting('my.number_of_coutries')::int) + 1)::int
+FROM GENERATE_SERIES(1, current_setting('my.number_of_cities')::int) as id;
+
+-- Filling of sales
+
+INSERT INTO sale
+select id 
+	, round(CAST(float8 (random() * 10000) as numeric), 3)
+	, TO_TIMESTAMP(start_date, 'YYYY-MM-DD HH24:MI:SS') +
+		random()* (TO_TIMESTAMP(end_date, 'YYYY-MM-DD HH24:MI:SS') 
+							- TO_TIMESTAMP(start_date, 'YYYY-MM-DD HH24:MI:SS'))
+	, floor(random() * (current_setting('my.number_of_products')::int) + 1)::int
+	, floor(random() * (current_setting('my.number_of_cities')::int) + 1)::int
+FROM GENERATE_SERIES(1, current_setting('my.number_of_sales')::int) as id
+	, current_setting('my.start_date') as start_date
+	, current_setting('my.end_date') as end_date;