SQL databases are relational while NoSQL databases are non-relational.
A relational database is a digital database based on the relational model of data.
A non-relational database is not based on the traditional table structure that you may be used to. Instead, it is based on a more flexible model that can be adapted to fit the needs of the application.
2. Data schemas
SQL databases use a predefined schema and structured query language.
NoSQL databases have dynamic schemas that can accommodate unstructured data, which is often stored in a variety of ways.
SQL databases are known for their ability to scale vertically in most situations.
It means you can increase the performance by adding more resources like CPU, RAM, or faster hard drives.
NoSQL databases are able to scale horizontally, meaning they can handle an increased workload by adding more servers.
4. Data structure
SQL databases store data in tables.
NoSQL databases are usually a document or key-value stores.
5. Use cases
SQL databases are the best choice for complex queries. If the data integrity and transactions are the requirements the SQL is better than NoSQL.
If you’re working with constantly changing data structures or JSON data, NoSQL could be a better choice.