What are relational databases?
user
These are databases that use links to connect data.  These can be used to help identify data that has similar attributes or values.
assistant
What are the different relational databases that exist?
user
There are a variety of different types of relational databases. Some of the most common are:

SQL
RDF

You can find out more information about these on Wikipedia.  What other kinds of relational databases do you want to learn about?
assistant
What are relational databases?
user
These are databases that use links to connect data.  These can be used to help identify data that has similar attributes or values.
assistant
What are the different relational databases that exist?
user
Relational databases are databases that are based on “relations” between objects.  Many different relational databases are used in data analysis, but they all share similar characteristics.  For example, Oracle is a relational database.
assistant
What are relational databases?