1. Relationships among FDs and ERDs.
In the previous lectures, we saw that a schema that can be generated from a mapped translation satisfies 3NF. In reverse direction, we can generate all FDs from an ERD. We discuss these FDs from Intra FDs and Inter FDs.

2. Cont’
(1) Intra FDs:
- The identifier of an entity determines all non-key attributes.
(2) Inter FDs

3. Inter FDs
Suppose we have a relationship R between entity A and entity B, where whose primary keys are A# and B#.
Then, we have the following FDs between two entities, depending on cardinality:
(a) 1:1 A# --> B#
B# --> A#
(b) 1:N B# --> A# (note: A# -/-> B#)

4. Inter FDs
(c) M:N no FDs between A# and B# (note: A# -/-> B# and B# -/-> A# )
Suppose relationship R has an attribute called W. Then, we have:
A#B# --> W

5. Cont’

6. Intra FDs Pic# -->PicTitle, PicYear
PicArtist -->ArtistCountry, ArtistType
Museum# -->MuseumName, MuseumAddr

7. Inter FDs
Pic# -->PicArtist, Museum#

8. Cont’ Thus, we can combine them based on their common LHS.
Pic# -->PicTitle, PicYear, PicArtist, Museum#
PicArtist -->ArtistCountry, ArtistType
Museum# -->MuseumName, MuseumAddr