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<h2><a href="https://leetcode.com/problems/find-followers-count/">1729. Find Followers Count</a></h2><h3>Easy</h3><hr><div class="sql-schema-wrapper__3VBi"><a class="sql-schema-link__3cEg">SQL Schema<svg viewBox="0 0 24 24" width="1em" height="1em" class="icon__1Md2"><path fill-rule="evenodd" d="M10 6L8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"></path></svg></a></div><div><p>Table: <code>Followers</code></p> | ||
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<pre>+-------------+------+ | ||
| 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.</pre> | ||
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<p> </p> | ||
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<p>Write a solution that will, for each user, return the number of followers.</p> | ||
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<p>Return the result table ordered by <code>user_id</code> in ascending order.</p> | ||
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<p>The result format is in the following example.</p> | ||
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<p> </p> | ||
<p><strong class="example">Example 1:</strong></p> | ||
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<pre><strong>Input:</strong> | ||
Followers table: | ||
+---------+-------------+ | ||
| user_id | follower_id | | ||
+---------+-------------+ | ||
| 0 | 1 | | ||
| 1 | 0 | | ||
| 2 | 0 | | ||
| 2 | 1 | | ||
+---------+-------------+ | ||
<strong>Output:</strong> | ||
+---------+----------------+ | ||
| user_id | followers_count| | ||
+---------+----------------+ | ||
| 0 | 1 | | ||
| 1 | 1 | | ||
| 2 | 2 | | ||
+---------+----------------+ | ||
<strong>Explanation:</strong> | ||
The followers of 0 are {1} | ||
The followers of 1 are {0} | ||
The followers of 2 are {0,1} | ||
</pre> | ||
</div> |