Being a developer, you need to take care of many things and at the same time, you have to fulfill the clients requirements efficiently. Because lots of time, it happens that you have to capture unique values from your client and stored into a database for later use. And, If you are master the database to handle data using PHP queries then things will be a lot easier for you to work and fulfill Magento requirements.

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You probably came across a requirement of storing it in one column without repetition or storing similar items for which you need to create one unique key for that column. Doing this will help you from storing similar data in the same database table column. So, if you are looking for creating a unique key column in the db_schema.xml file of Magento 2, here is how you can do it.
To do the same first, we need to create a simple db_schema.xml file using the below code.
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