LeetCode 626. Exchange Seats | SQL Solution | Medium Database Problem

Welcome to another LeetCode SQL tutorial! In this video, we tackle Problem 626. Exchange Seats, a Medium-level challenge from the Database category.

The task is to write an SQL query to swap the seat IDs of every two consecutive students in the Seat table. If the total number of students is odd, the id of the last student is not swapped.

In this solution, we will:

Understand the problem requirements and the structure of the Seat table.

Develop a robust SQL query using the CASE statement.

Use modulo arithmetic (id % 2) to distinguish between odd and even seat IDs.

Implement the logic to swap seat numbers and handle the last student in case of an odd total count.

Ensure the final result is ordered by id.

This is a great problem to practice your SQL conditional logic and data manipulation skills.

Key Concepts:

SQL CASE Statement

Modulo Operator (% or MOD)

ORDER BY Clause

Database Manipulation

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Видео LeetCode 626. Exchange Seats | SQL Solution | Medium Database Problem канала Vivek The Analyst