From 875b4c007cc2d7886c912e9289b4409e75cb2246 Mon Sep 17 00:00:00 2001
From: Hinduja Cheela <hindujacheela@Mac.attlocal.net>
Date: Wed, 4 Jun 2025 14:50:47 -0500
Subject: [PATCH] Added two solutions

---
 CustomersWho.sql    |  5 +++++
 ProductAnalysis.sql | 19 +++++++++++++++++++
 README.md           |  3 ++-
 3 files changed, 26 insertions(+), 1 deletion(-)
 create mode 100644 CustomersWho.sql
 create mode 100644 ProductAnalysis.sql

diff --git a/CustomersWho.sql b/CustomersWho.sql
new file mode 100644
index 0000000..5f57ed6
--- /dev/null
+++ b/CustomersWho.sql
@@ -0,0 +1,5 @@
+
+select customer_id
+from customer
+group by customer_id
+having count(distinct product_key)=(select count(product_key) from product);
\ No newline at end of file
diff --git a/ProductAnalysis.sql b/ProductAnalysis.sql
new file mode 100644
index 0000000..6d8e28f
--- /dev/null
+++ b/ProductAnalysis.sql
@@ -0,0 +1,19 @@
+
+-- Solution 1
+
+select product_id, year as first_year, quantity, price
+from (
+    select s.product_id, s.year, s.quantity, s.price,
+           DENSE_RANK() over (partition by product_id order by year) as rnk
+    from sales s
+) ranked
+where rnk = 1;
+
+-- Solution 2
+
+select s.product_id,newtab.first_year,s.quantity,s.price
+from (select product_id, min(year) as first_year
+     from sales
+     group by product_id) as newtab
+join sales s
+on newtab.product_id=s.product_id and newtab.first_year=s.year;
diff --git a/README.md b/README.md
index eceb926..9fd0400 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,2 @@
-# Mock_SQL2
\ No newline at end of file
+# Mock_SQL2
+