Update Q1.sql

Used Instagram-Like database and analyzed some of the important insights using SQL

Author: Somnath-pandit

Q1.sql

@@ -135,3 +135,34 @@ FROM
 
 
 
+ -- 10.Show the username of each user along with the number 
+ -- of photos they have posted and the number of photos posted by the user
+ -- before them and after them, based on the creation date.
+
+USE ig_clone;
+WITH UserPhotoCounts AS (
+    SELECT
+        u.id,
+        u.username,
+        COUNT(p.id)  photo_count,
+        MIN(p.created_at) first_photo_date
+        
+    FROM users u
+    LEFT JOIN photos p ON u.id = p.user_id
+    GROUP BY u.id, u.username
+),
+UserPhotoCountsPrevNext AS (
+    SELECT
+        upc.*,
+        ROW_NUMBER() OVER (ORDER BY upc.first_photo_date) AS rw_number
+    FROM UserPhotoCounts upc
+)
+
+SELECT
+    upc.username,
+    upc.photo_count,
+    LAG(upc.photo_count) OVER (ORDER BY upc.rw_number) AS prev_photo_count,
+    LEAD(upc.photo_count) OVER (ORDER BY upc.rw_number) AS next_photo_count
+FROM UserPhotoCountsPrevNext upc
+ORDER BY upc.rw_number;
+