added readme files, and the database/datawarehouse documentation.

BI-queries/README.md

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+this is where the Main Business Quueries will be.

ETL/README.md

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+ETL process Documentation.

northwind-dwh/README.md

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+the data warehouse documentation.

northwind-dwh/northwind_dwh_ddl.sql

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+-- This script was generated by the ERD tool in pgAdmin 4.
+-- Please log an issue at https://github.com/pgadmin-org/pgadmin4/issues/new/choose if you find any bugs, including reproduction steps.
+BEGIN;
+
+
+CREATE TABLE IF NOT EXISTS public.customers_dim
+(
+    cust_sk integer NOT NULL GENERATED ALWAYS AS IDENTITY ( INCREMENT 1 START 1 MINVALUE 1 MAXVALUE 2147483647 CACHE 1 ),
+    cust_id "char" NOT NULL,
+    contact_name character varying(30) COLLATE pg_catalog."default" NOT NULL,
+    company_name character varying(40) COLLATE pg_catalog."default" NOT NULL,
+    cust_city character varying(15) COLLATE pg_catalog."default" NOT NULL,
+    cust_country character varying(15) COLLATE pg_catalog."default",
+    CONSTRAINT customers_dim_pkey PRIMARY KEY (cust_sk)
+);
+
+CREATE TABLE IF NOT EXISTS public.date_dim
+(
+    date_sk integer NOT NULL GENERATED ALWAYS AS IDENTITY ( INCREMENT 1 START 1 MINVALUE 1 MAXVALUE 2147483647 CACHE 1 ),
+    date_id character varying(50) COLLATE pg_catalog."default" NOT NULL,
+    date_field date NOT NULL,
+    year numeric(4, 0) NOT NULL,
+    month numeric(2, 0) NOT NULL,
+    quarter numeric(1, 0) NOT NULL,
+    day_of_month numeric(2, 0) NOT NULL,
+    day_of_week character varying(30) COLLATE pg_catalog."default" NOT NULL,
+    day_of_year numeric(3, 0) NOT NULL,
+    CONSTRAINT date_dim_pkey PRIMARY KEY (date_sk)
+);
+
+CREATE TABLE IF NOT EXISTS public.employees_dim
+(
+    emp_sk integer NOT NULL GENERATED ALWAYS AS IDENTITY ( INCREMENT 1 START 1 MINVALUE 1 MAXVALUE 2147483647 CACHE 1 ),
+    emp_id smallint NOT NULL,
+    emp_title character varying(30) COLLATE pg_catalog."default" NOT NULL,
+    hire_date date NOT NULL,
+    emp_report_to smallint NOT NULL,
+    CONSTRAINT employees_dim_pkey PRIMARY KEY (emp_sk)
+);
+
+CREATE TABLE IF NOT EXISTS public.products_dim
+(
+    product_sk integer NOT NULL GENERATED ALWAYS AS IDENTITY ( INCREMENT 1 START 1 MINVALUE 1 MAXVALUE 2147483647 CACHE 1 ),
+    product_id smallint NOT NULL,
+    product_name character varying(40) COLLATE pg_catalog."default" NOT NULL,
+    supplier_id smallint NOT NULL,
+    supplier_name character varying(40) COLLATE pg_catalog."default" NOT NULL,
+    category_id smallint NOT NULL,
+    category_name character varying(15) COLLATE pg_catalog."default" NOT NULL,
+    quantity_per_unit character varying(20) COLLATE pg_catalog."default" NOT NULL,
+    unit_price real NOT NULL,
+    units_in_stock smallint NOT NULL,
+    units_on_order smallint NOT NULL,
+    record_level smallint NOT NULL,
+    discontinued integer NOT NULL,
+    CONSTRAINT products_dim_pkey PRIMARY KEY (product_sk)
+);
+
+CREATE TABLE IF NOT EXISTS public.sales_fact
+(
+    order_id smallint NOT NULL,
+    sales_id integer NOT NULL GENERATED ALWAYS AS IDENTITY ( INCREMENT 1 START 1 MINVALUE 1 MAXVALUE 2147483647 CACHE 1 ),
+    product_sk integer NOT NULL,
+    order_date_sk integer NOT NULL,
+    required_date_sk integer NOT NULL,
+    shipped_date_sk integer NOT NULL,
+    emp_sk integer NOT NULL,
+    cust_sk integer NOT NULL,
+    supplier_company_name character varying(40) COLLATE pg_catalog."default" NOT NULL,
+    category_name character varying(15) COLLATE pg_catalog."default" NOT NULL,
+    unit_price real NOT NULL,
+    quantity_per_order smallint NOT NULL,
+    discount real NOT NULL,
+    freight real NOT NULL,
+    ship_city character varying(15) COLLATE pg_catalog."default" NOT NULL,
+    ship_country character varying(15) COLLATE pg_catalog."default" NOT NULL,
+    total_price real NOT NULL,
+    shipper_company_name character varying(40) NOT NULL,
+    CONSTRAINT sales_fact_pkey PRIMARY KEY (sales_id)
+);
+
+ALTER TABLE IF EXISTS public.employees_dim
+    ADD CONSTRAINT fk_emp_recursive_mgr FOREIGN KEY (emp_report_to)
+    REFERENCES public.employees_dim (emp_sk) MATCH SIMPLE
+    ON UPDATE NO ACTION
+    ON DELETE NO ACTION
+    NOT VALID;
+
+
+ALTER TABLE IF EXISTS public.sales_fact
+    ADD CONSTRAINT sales_fact_cust_sk_fkey FOREIGN KEY (cust_sk)
+    REFERENCES public.customers_dim (cust_sk) MATCH SIMPLE
+    ON UPDATE NO ACTION
+    ON DELETE NO ACTION
+    NOT VALID;
+
+
+ALTER TABLE IF EXISTS public.sales_fact
+    ADD CONSTRAINT sales_fact_emp_sk_fkey FOREIGN KEY (emp_sk)
+    REFERENCES public.employees_dim (emp_sk) MATCH SIMPLE
+    ON UPDATE NO ACTION
+    ON DELETE NO ACTION
+    NOT VALID;
+
+
+ALTER TABLE IF EXISTS public.sales_fact
+    ADD CONSTRAINT sales_fact_order_date_sk_fkey FOREIGN KEY (order_date_sk)
+    REFERENCES public.date_dim (date_sk) MATCH SIMPLE
+    ON UPDATE NO ACTION
+    ON DELETE NO ACTION
+    NOT VALID;
+
+
+ALTER TABLE IF EXISTS public.sales_fact
+    ADD CONSTRAINT sales_fact_product_sk_fkey FOREIGN KEY (product_sk)
+    REFERENCES public.products_dim (product_sk) MATCH SIMPLE
+    ON UPDATE NO ACTION
+    ON DELETE NO ACTION
+    NOT VALID;
+
+
+ALTER TABLE IF EXISTS public.sales_fact
+    ADD CONSTRAINT sales_fact_required_date_sk_fkey FOREIGN KEY (required_date_sk)
+    REFERENCES public.date_dim (date_sk) MATCH SIMPLE
+    ON UPDATE NO ACTION
+    ON DELETE NO ACTION
+    NOT VALID;
+
+
+ALTER TABLE IF EXISTS public.sales_fact
+    ADD CONSTRAINT sales_fact_shipped_date_sk_fkey FOREIGN KEY (shipped_date_sk)
+    REFERENCES public.date_dim (date_sk) MATCH SIMPLE
+    ON UPDATE NO ACTION
+    ON DELETE NO ACTION
+    NOT VALID;
+
+END;