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
MySQL and Postgres.
user
MySQL and Postgres are different types of relational databases.  I can explain more about each of these.
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
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
MySQL and Postgres.
user
I can’t say for sure that these are relational databases, because I don’t know all of their detailed technical specifications.  But I think MySQL is a type of relational database.  It’s a very popular relational database, and has a long history.  You can get information about MySQL on Wikipedia.
assistant
What are relational databases?