1. Final Review Sunday March 13th

2. Databases –Entities/Rows –Attributes/Columns –Keys –Relationships –Schema –Instance

3. Databases –Entities/Rows -”theme” –Attributes/Columns - characterisitics about entities –Keys - unique row identifiers -EVERY ROW MUST HAVE ONE –Relationships - associations among data - Foreign keys –Schema - Table structure –Instance - Table contents

4. Good databases One copy of data - Why? Relationships between tables - How?

5. Databases operations Project Select Union Difference Product

6. Databases operations Project - pick columns Select - pick rows Union - combine two tables Difference - remove one table from another Product - create all possible pairs

7. Info Retrieval Use QUERIES to retrieve info from databases Relationships –One - to - one –One - to - many –Many - to - many Primary keys Foreign keys

8. Info retrieval One - to - many: –The ONE is the primary key and is used as a foreign key in the MANY’s table Many - to - many: – Cross reference table! To reduce into 1 - to- many

9. Forms GUI Front end of the database Easier way to: –Present info –Add content Adding an image to a form – Database stores a link to the image file (same as html)

10. Reports Make DB look pretty! Easier way to: –Arrange data –Present data How is it done in access: –Wizard - easier –Design mode - customizable

11. Binary numbers What does each number position represent? Convert from hex to decimal Convert from binary to decimal Why represent info. Using binary numbers?

12. Representing info in binary Text Color Pictures Sound Anything! –How are continuous signals represented in binary?

13. Representing info in binary Text Color Pictures Sound Anything! –How are continuous signals represented in binary? FIRST DISCRETIZE (OR DIGITIZE), THEN REPRESENT!

14. Privacy online Privacy Statements Cookies –Good? –Bad? –Can I do anything about it?

15. Privacy principles Limited collection –Knowledge and consent whenever appropriate Quality –Relevant to the purpose. Accurate and complete Purpose –Purpose should be stated. Limit use to purpose Use Limitation –Limit the use to the purpose unless authorized

16. Privacy Principles Security –Against disclosure, access, misuse, modification, destruction, loss Openness –Let users know anything you can! Participation –Let users have control over their data (as much as possible Accountability –The controller is accountable

17. First midterm stuff HTML

18. Second midterm stuff