Add rounding effect analysis

Signed-off-by: Even Wei <shinycockorach@gmail.com>

Author: even-wei

models/rounding_effect.sql

@@ -0,0 +1,6 @@
+SELECT
+       order_id, 
+       ROUND(amount) AS rounded_amount_dollar,
+       amount_cent,
+       (ROUND(amount) * 100 - amount_cent) AS rounding_difference_cents
+FROM {{ ref('stg_payments') }}

models/staging/stg_payments.sql

@@ -16,7 +16,8 @@ renamed as (
         payment_method,
 
         -- `amount` is currently stored in cents, so we convert it to dollars
-        amount / 100 as amount
+        amount / 100 as amount,
+        amount as amount_cent
 
     from source