Upload 134

Author: ggeerraarrdd

README.md

@@ -166,6 +166,7 @@ The problems and both submitted and site solutions are documented in individual
 | 131   | [Exchange Seats](https://leetcode.com/problems/exchange-seats/description/)                                                                                   | [Solution](solutions/131_exchange_seats.md)                                           | LeetCode    | Medium       | `CASE` w/ `LAG` w/ `COALESCE`                                       |
 | 132   | [Movie Rating](https://leetcode.com/problems/movie-rating/description/)                                                                                       | [Solution](solutions/132_movie_rating.md)                                             | LeetCode    | Medium       |                                                                     |
 | 133   | [Restaurant Growth](https://leetcode.com/problems/restaurant-growth/description/)                                                                             | [Solution](solutions/133_restaurant_growth.md)                                        | LeetCode    | Medium       |                                                                     |
+| 134   | [Friend Requests II: Who Has the Most Friends](https://leetcode.com/problems/friend-requests-ii-who-has-the-most-friends/description/)                        | [Solution](solutions/134_friend_requests_ii_who_has_the_most_friends.md)              | LeetCode    | Medium       | `UNION ALL`                                                         |
 <!-- Index End - WARNING: Do not delete or modify this markdown comment. -->
 
 ## Author(s)

solutions/134_friend_requests_ii_who_has_the_most_friends.md

@@ -0,0 +1,83 @@
+# SQL Everyday \#134
+
+## Friend Requests II: Who Has the Most Friends
+
+Site: LeetCode\
+Difficulty per Site: Medium
+
+## Problem
+
+Write a solution to find the people who have the most friends and the most friends number.
+
+The test cases are generated so that only one person has the most friends. [[Full Description](https://leetcode.com/problems/friend-requests-ii-who-has-the-most-friends/description/)]
+
+## Submitted Solution
+
+```sql
+-- Submitted Solution
+WITH cte1 AS (
+    SELECT
+        accepter_id AS id
+        ,COALESCE(COUNT(DISTINCT requester_id), 0) AS total
+    FROM RequestAccepted
+    GROUP BY accepter_id
+),
+cte2 AS (
+    SELECT
+    requester_id AS id
+    ,COALESCE(COUNT(DISTINCT accepter_id), 0) AS total
+FROM RequestAccepted
+GROUP BY requester_id
+),
+cte3 AS (
+    SELECT
+        *
+    FROM cte1 
+    UNION ALL
+    SELECT
+        *
+    FROM cte2
+)
+SELECT
+    id
+    ,SUM(total) AS num
+FROM cte3
+GROUP BY id
+ORDER BY num DESC
+LIMIT 1
+;
+```
+
+## Site Solution
+
+```sql
+-- LeetCode Solution 
+WITH all_ids AS (
+   SELECT requester_id AS id 
+   FROM RequestAccepted
+   UNION ALL
+   SELECT accepter_id AS id
+   FROM RequestAccepted)
+SELECT id, num
+FROM 
+   (
+   SELECT id, 
+      COUNT(id) AS num, 
+      RANK () OVER(ORDER BY COUNT(id) DESC) AS rnk
+   FROM all_ids
+   GROUP BY id
+   )t0
+WHERE rnk=1
+```
+
+## Notes
+
+TBD
+
+## NB
+
+`UNION ALL`
+
+Go to [Index](../?tab=readme-ov-file#index)\
+Go to [Overview](../?tab=readme-ov-file)
+