Create 602. Friend Requests II.sql

Author: iamAntimPal

LeetCode SQL 50 Solution/602. Friend Requests II.sql

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+602. Friend Requests II: Who Has the Most Friends
+Solved
+Medium
+Topics
+Companies
+Hint
+SQL Schema
+Pandas Schema
+Table: RequestAccepted
+
++----------------+---------+
+| Column Name    | Type    |
++----------------+---------+
+| requester_id   | int     |
+| accepter_id    | int     |
+| accept_date    | date    |
++----------------+---------+
+(requester_id, accepter_id) is the primary key (combination of columns with unique values) for this table.
+This table contains the ID of the user who sent the request, the ID of the user who received the request, and the date when the request was accepted.
+ 
+
+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.
+
+The result format is in the following example.
+
+ 
+
+Example 1:
+
+Input: 
+RequestAccepted table:
++--------------+-------------+-------------+
+| requester_id | accepter_id | accept_date |
++--------------+-------------+-------------+
+| 1            | 2           | 2016/06/03  |
+| 1            | 3           | 2016/06/08  |
+| 2            | 3           | 2016/06/08  |
+| 3            | 4           | 2016/06/09  |
++--------------+-------------+-------------+
+Output: 
++----+-----+
+| id | num |
++----+-----+
+| 3  | 3   |
++----+-----+
+Explanation: 
+The person with id 3 is a friend of people 1, 2, and 4, so he has three friends in total, which is the most number than any others.
+ 
+
+Follow up: In the real world, multiple people could have the same most number of friends. Could you find all these people in this case?
+
+
+