Table: Followers
+-------------+------+ +| Column Name | Type | ++-------------+------+ +| user_id | int | +| follower_id | int | ++-------------+------+ +(user_id, follower_id) is the primary key (combination of columns with unique values) for this table. +This table contains the IDs of a user and a follower in a social media app where the follower follows the user.+ +
+ +
Write a solution that will, for each user, return the number of followers.
+ +Return the result table ordered by user_id in ascending order.
The result format is in the following example.
+ ++
Example 1:
+ +Input:
+Followers table:
++---------+-------------+
+| user_id | follower_id |
++---------+-------------+
+| 0 | 1 |
+| 1 | 0 |
+| 2 | 0 |
+| 2 | 1 |
++---------+-------------+
+Output:
++---------+----------------+
+| user_id | followers_count|
++---------+----------------+
+| 0 | 1 |
+| 1 | 1 |
+| 2 | 2 |
++---------+----------------+
+Explanation:
+The followers of 0 are {1}
+The followers of 1 are {0}
+The followers of 2 are {0,1}
+
+