1. RA examples

2. Let’s build a Family DB

3. ERD Person Bday Byear Gender Name

4. ERD Parent Role Person Bday Byear Gender Name

5. ERD Is this ERD perfect? Can you make it closer to the real world? Parent Role Parent Role Person Bday Byear Gender Name

6. Building the basic family tree

8. Grandparents:

13. Ancestors

14. Cousins

15. K-Cousins

16. K-Cousins m-times removed

17. First-Born children Definition: – A person is a first born if at least one of it’s parents doesn’t have any children older than the person.

18. First-Born children

20. Let’s add spouses… We can make our DB a bit more complicated: Spouse(Name, Byear, Bday, SpouseName, SpouseByear, SpouseBday) Parent Role Parent Role Person Bday Byear Gender Name Spouse

21. In-laws Definition: – A person’s -in-laws our the person’s spouse’s – Parent-in-law = spouse’s parent – Sibling-in-law = spouse’s sibling – …

22. In-laws

23. Question Get the names of all the mothers that gave birth every year during the 80’s (clue: use division)

24. Answer