Update README.md

ieshreya · ieshreya · commit 1245451e029b · 2024-03-30T00:32:18.000+05:30
diff --git a/README.md b/README.md
@@ -606,4 +606,24 @@ FROM (
     FROM Customer
 ) t
 WHERE visited_on >= day_1+6;
-```
+```
+
+
+[602. Friend Requests II: Who Has the Most Friends](https://leetcode.com/problems/friend-requests-ii-who-has-the-most-friends)
+
+```sql
+-- `union` selects only unique vals, so we use `union all` here
+
+WITH CTE AS (
+    SELECT requester_id AS id FROM RequestAccepted
+    UNION ALL
+    SELECT accepter_id AS id FROM RequestAccepted
+)
+
+SELECT id, COUNT(id) AS num
+FROM CTE
+GROUP BY id
+ORDER BY num DESC
+LIMIT 1
+```
+
