Create 3_date_range_exploration.sql

Author: DataWithBaraa

scripts/3_date_range_exploration.sql

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+/*
+===============================================================================
+Date Range Exploration 
+===============================================================================
+Purpose:
+    - To determine the temporal boundaries of key data points.
+    - To understand the range of historical data.
+
+SQL Functions Used:
+    - MIN(), MAX(), DATEDIFF()
+===============================================================================
+*/
+
+-- Determine the first and last order date and the total duration in months
+SELECT 
+    MIN(order_date) AS first_order_date,
+    MAX(order_date) AS last_order_date,
+    DATEDIFF(MONTH, MIN(order_date), MAX(order_date)) AS order_range_months
+FROM gold.fact_sales;
+
+-- Find the youngest and oldest customer based on birthdate
+SELECT
+    MIN(birthdate) AS oldest_birthdate,
+    DATEDIFF(YEAR, MIN(birthdate), GETDATE()) AS oldest_age,
+    MAX(birthdate) AS youngest_birthdate,
+    DATEDIFF(YEAR, MAX(birthdate), GETDATE()) AS youngest_age
+FROM gold.dim_customers;