From 037e485a802f88d608b08defafddd568e4de7107 Mon Sep 17 00:00:00 2001
From: tejas274 <shahtejas274@gmail.com>
Date: Mon, 2 Jun 2025 10:52:01 -0400
Subject: [PATCH] feat: problem 1 and 2 added

---
 ...-1045-customer-who-bought-all-products.sql | 13 ++++++++++++
 problem2-1070-Product-Sales-Analysis-III.sql  | 21 +++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 problem1-1045-customer-who-bought-all-products.sql
 create mode 100644 problem2-1070-Product-Sales-Analysis-III.sql

diff --git a/problem1-1045-customer-who-bought-all-products.sql b/problem1-1045-customer-who-bought-all-products.sql
new file mode 100644
index 0000000..7ea2a6b
--- /dev/null
+++ b/problem1-1045-customer-who-bought-all-products.sql
@@ -0,0 +1,13 @@
+with customer_product_purchase as (
+    select
+        customer_id,
+        count(distinct product_key) as cnt
+    from
+        customer
+    group by customer_id
+)
+
+select customer_id
+from
+    customer_product_purchase
+where cnt = (select count(product_key) from product)
diff --git a/problem2-1070-Product-Sales-Analysis-III.sql b/problem2-1070-Product-Sales-Analysis-III.sql
new file mode 100644
index 0000000..1d83af6
--- /dev/null
+++ b/problem2-1070-Product-Sales-Analysis-III.sql
@@ -0,0 +1,21 @@
+with product_sale_year as (
+    select
+        product_id,
+        year as first_year,
+        quantity,
+        price,
+        dense_rank() over (
+            partition by product_id
+            order by year
+        ) as rnk
+    from
+        sales
+)
+
+select
+    product_id,
+    first_year,
+    quantity,
+    price
+from product_sale_year
+where rnk = 1
\ No newline at end of file