Add average by grade model

transform/models/L2_core/martyg_avg_by_grade.sql

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+with raw_source as (
+
+    select * from {{ ref('stg_martyg_personal_loans') }}
+
+),
+
+final as (
+
+    select
+        grade,
+        avg(loan_amnt) as avg_loan_amount,
+        count(*) as total_loans
+    from raw_source
+    where loan_status = 'Fully Paid'
+    group by grade
+    order by grade
+
+)
+
+select * from final

transform/models/L2_core/martyg_avg_by_grade.yml

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+version: 2
+
+models:
+  - name: martyg_avg_by_grade
+    description: 'Martys model calculating average by grade'
+    columns:
+      - name: grade
+      - name: avg_loan_amount
+      - name: total_loans