What is the purpose of creating a unique index with Navicat?

A unique index is a type of database index that ensures that the values in a specific column or columns in a table are unique, meaning duplicate values are not allowed. By creating a unique index, it can enhance the efficiency of database queries, prevent data redundancy and duplication, and ensure the integrity and consistency of data. Unique indexes can be used to speed up table lookup operations, and when inserting, updating, or deleting data, it can effectively validate the consistency of data to avoid inserting or updating duplicate data.