Databases

What is the difference between data and information?
What are the features of the relational database model?
What are the advantages of the relational database model?
Who invented the relational database model? When?
What was used before using databases?
What other database models are there?
What is data integrity? Why is it important? Which features support it?
What is a data dictionary?
How does a relational database retrieve information?
What is SQL, SBE?
What is a field, record, file?
What is the difference between primary and secondary (foreign) keys? Where are they used?