Question

6. Design an ER schema with attributes, primary keys, cardinalities and participation constraints if appropriate. For keeping track of information about votes taken in the U.S. House of Representatives during the current two-year congressional session. The database needs to keep track of each U.S. STATE’S Name (e.g., Texas, New York, California) and include the Region of the state (whose domain is {North-east, Midwest, South-east, Southwest, West}). Each CONGRESSPERSON in the House of Representatives is described by his or her name, plus the District represented, the StartDate when the congressperson was first elected, and the political party to which he or she belongs (whose domain is {Republican, Democrat, Independent, Other}). The database keeps track of each BILL (i.e., proposed law), including the BillName, the DateQtVete on the bill, whether the bill PassedQrEailed (whose domain is {Yes, No}, and the Sponsor (the congressperson(s) who sponsored-that is, proposed-the bill). The database keeps track of how each congressperson voted on each bill (domain of vote attribute is {Yes, No, Abstain, Absent}). Draw an ER schema diagram for this application. State clearly any assumptions you make. (15 Points)

Answer 1

Satrt date Name_of_state) Region_of_state Dist_represented Political party Key ) Кеу CONGRESS_PERSON US_STATES_REGION REPRESENTATIVE VOTED FOR Vote SPONSOR Bill name BILL + Date of vote Passed_or_failed Sponsor

ASSUMPTIONS:

1. Each CONGRESS_PERSON can represent one district and one district is represented by one CONGRESS_MAN.

2. Bill is sponsored by one CONGRESS_MAN.

3. Every BILL has different name.

Above schema has three entity types

1. US_STATE_REGION: represents states and regions in US

2. CONGRESS_PERSON: who are elected from various regions and are related to US_STATE_REGION by relationship REPRESENTATIVE.

3. BILL: each bill is related to CONGRESS_PERSON, who presents it and is voted by all CONGRESS_MAN.