> For the complete documentation index, see [llms.txt](https://jaywin.gitbook.io/leetcode/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jaywin.gitbook.io/leetcode/solutions/1729-find-followers-count.md).

# 1729. Find Followers Count

<https://leetcode.com/problems/find-followers-count>

## Description

Table: `Followers`

```
+-------------+------+
| Column Name | Type |
+-------------+------+
| user\_id     | int  |
| follower\_id | int  |
+-------------+------+
(user\_id, follower\_id) is the primary key 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 an SQL query that will, for each user, return the number of followers.

Return the result table ordered by `user_id`.

The query result format is in the following example:

```
Followers table:
+---------+-------------+
| user\_id | follower\_id |
+---------+-------------+
| 0       | 1           |
| 1       | 0           |
| 2       | 0           |
| 2       | 1           |
+---------+-------------+
Result table:
+---------+----------------+
| user\_id | followers\_count|
+---------+----------------+
| 0       | 1              |
| 1       | 1              |
| 2       | 2              |
+---------+----------------+
The followers of 0 are {1}
The followers of 1 are {0}
The followers of 2 are {0,1}
```

## ac

```java
```