Add finance and sales models for returned order value and monthly cus…

…tomer count

jaffle_shop/models/final/finance/_models.yml

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+version: 2
+
+models:
+- name: fnl_returned_order_value
+  meta:
+    owner: [email protected]
+  description: | 
+    One row per total value of returned orders per customer
+  columns: 
+    - name: customer_id
+      description: Primary key
+      tests:
+        - unique
+        - not_null
+

jaffle_shop/models/final/finance/fnl_returned_order_value.sql

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+WITH returned_orders AS (
+  SELECT * 
+  FROM {{ ref('wh_orders') }}
+  WHERE status = 'returned'
+)
+
+customers AS (
+  SELECT * 
+  FROM {{ref('stg_customers') }}
+)
+
+SELECT 
+  customer_id
+  , SUM(COALESCE(total_amount, 0) AS total_value
+FROM returned_orders
+LEFT JOIN customers
+  ON returned_orders.customer_id = customers.customer_id
+GROUP BY customer_id

jaffle_shop/models/final/sales/_models.yml

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+version: 2
+
+models:
+- name: fnl_monthly_customer_count
+  meta:
+    owner: [email protected]
+  description: | 
+    One row per customer count for each month based on their first orders. 
+  columns: 
+    - name: first_order_month
+      description: Primary key
+      tests:
+        - unique
+        - not_null

jaffle_shop/models/final/sales/fnl_monthly_customer_count.sql

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+WITH customer_orders AS (
+  SELECT 
+    customer_id
+    , DATE_FORMAT(first_order, 'MMMM') As order_month
+  FROM {{ ref('wh_customers') }}
+)
+
+SELECT 
+  first_order AS first_order_month
+  , COUNT(*) AS customer_count
+FROM customer_orders
+GROUP BY first_order