Comparing SQL and Prolog

Question

I\'ve started learning Prolog and wondering about the theoretical difference from the SQL language.

For example:

• both are declarative languages
• b

Answer 1

There are many differences which I think become clear when you start using them. Remember because of changes in terminology, somethings which are called the same thing in the past mean very different things now.

Very broad overview of difference.

SQL statements work against a relational database and query (ask for) data from that database, changes to that data and the results are exactly expressed in the language, whereas in Prolog you define facts and a logic engine generates new facts based off of the existing facts. New data (facts) are created via evaluation.

They both use something called queries (but they work totally differently) and they both have data (but use it differently.)

The use cases for SQL and Prolog are also totally different. It would never make sense to store an address list in Prolog whereas that is exactly what SQL was designed to do.

Simply put SQL is used to access a data store and Prolog is an expression evaluator.