Advantages of Unique Key
- As we have discussed above, a unique key is used to remove duplicity in the table.
- A unique key helps to maintain the data integrity of the database by ensuring that no two records have the sane identifier, hence preventing inconsistencies and errors.
- It is also used as a primary key or foreign key in relational databases to establish relationships between tables, ensuring accuracy and consistency across related tables.
- It is automatically indexed in most DBMS implementations, which can improve query performance by providing faster searches and retrieval of data.
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.