Indexing and Performance
When you create unique key in database, it creates an index for columns involved automatically. So in a book index is present which helps you quickly find the information you wanted in book. Similarly in a database the index helps speed up searches for data, making it faster to retrieve information from the table. So by having unique keys you’re not only ensuring that your data is unique but also improving the performance of your database queries.
Unique Key in DBMS
A column or set of columns in a database system that uniquely identifies each tuple in the table is called a unique key. A unique key ensures that no two rows in the table have the same combination of values, so it enforces data integrity by preventing duplicity of the values in the table. In this article, we are going to see about the unique keys in DBMS along with their implementation in the table. Let’s start with the definition of a unique key.
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