Biggest Single Number and Find Followers Count SQL MySQL leetcode solution

Published: 18 May 2024
on channel: CodeWis Technologies by Nuhman Paramban

1). Biggest Single Number and 2). Find Followers Count SQL MySQL leetcode solution

Challenge: Counting User Followers

Difficulty: Easy

Data:

A table named Followers stores information about user followings in a social media application:

user_id (int): Unique identifier for a user. (Primary Key along with follower_id)
follower_id (int): Unique identifier for a user who follows another user (user_id).
Objective:

Calculate the number of followers for each user in the social media application.

Output:

A table with two columns:

user_id (int): Unique identifier for a user (same as input table).
followers_count (int): Number of followers this user has.
Explanation:

We need to count the occurrences of each distinct user_id in the follower_id column of the Followers table. This represents the number of users following each user (user_id).

Challenge: Finding the Largest Unique Number

Difficulty: Easy

Data:

A table named MyNumbers stores a collection of integer values:

num (int): An integer value. (No primary key)
Objective:

Find the largest integer value that appears only once (unique) in the MyNumbers table. If no unique numbers exist, return null.

Output:

A table with a single column:

num (int): The largest unique integer value in the table, or null if there are no unique values.
Explanation:

We need to identify the maximum value from the MyNumbers table that has a count of one (appears only once). If no such value exists, return null.

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