Add model for total amount spent per customer [1728502639062]

jaffle_shop/models/customer_total_amount_spent.sql

@@ -0,0 +1,37 @@
+{{
+  config(
+    materialized='table'
+  )
+}}
+
+with orders as (
+    select * from {{ ref('stg_orders') }}
+),
+
+order_amounts as (
+    select
+        customer_id,
+        order_id,
+        amount
+    from orders
+),
+
+customer_total_amount as (
+    select
+        customer_id,
+        sum(amount) as total_amount_spent
+    from order_amounts
+    group by customer_id
+),
+
+final as (
+    select
+        c.customer_id,
+        c.first_name,
+        c.last_name,
+        coalesce(cta.total_amount_spent, 0) as total_amount_spent
+    from {{ ref('stg_customers') }} c
+    left join customer_total_amount cta using (customer_id)
+)
+
+select * from final