IshaSQL
Foundations Track · Easy · 15 min
Find Followers Count
Table: Followers +-------------+------+ | Column Name | Type | +-------------+------+ | user_id | int | | follower_id | int | +-------------+------+ (user_id...
Company labels are directional practice context, not official interview guidance.
Objective
Practice aggregation through a IshaSQL-tagged business scenario.
Approach
Use this track to lock in clean query structure, basic filtering logic, and confidence with grouped output.
Company context
Company labels are directional practice context, not official interview guidance.
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}
Followers
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