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A supermarket chain promotes items regularly. Several offers are made each week, oftentimes with overlapping periods, for example, weekly offer, weekend offer and special branch offer. When a purchase is made for an item on a purchase date, and there are overlapping offer periods for that purchase date, the lowest offer price is chosen as the purchase price. An ItemOffer table from existing data was proposed: ItemOffer (ItemNo, ItemDescription, OfferID, OfferStartDate, OfferEndDate, NonOfferPrice, OfferPrice, ItemStockLevel, ReceiptNo, purchaseDatetime, QtyPurchased) (a) Formulate and list the functional and multi-valued dependencies. (b) Draw a dependency graph and propose candidate key(s) for the table ItemOffer.

A supermarket chain promotes items regularly. Several offers are made each week, oftentimes with overlapping periods, for example, weekly offer, weekend offer and special branch offer. When a purchase is made for an item on a purchase date, and there are overlapping offer periods for that purchase date, the lowest offer price is chosen as the purchase price. An ItemOffer table from existing data was proposed: ItemOffer (ItemNo, ItemDescription, OfferID, OfferStartDate, OfferEndDate, NonOfferPrice, OfferPrice, ItemStockLevel, ReceiptNo, purchaseDatetime, QtyPurchased) (a) Formulate and list the functional and multi-valued dependencies. (b) Draw a dependency graph and propose candidate key(s) for the table ItemOffer.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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A supermarket chain promotes items regularly. Several offers are made each week, oftentimes with overlapping periods, for example, weekly offer, weekend offer and special branch offer. When a purchase is made for an item on a purchase date, and there are overlapping offer periods for that purchase date, the lowest offer price is chosen as the purchase price. An ItemOffer table from existing data was proposed: ItemOffer (ItemNo, ItemDescription, OfferlID, OfferStartDate, OfferEndDate, NonOfferPrice, OfferPrice, ItemStockLevel, ReceiptNo, purchaseDatetime, QtyPurchased) (a) Formulate and list the functional and multi-valued dependencies. (b) Draw a dependency graph and propose candidate key(s) for the table ItemOffer.
Transcribed Image Text:A supermarket chain promotes items regularly. Several offers are made each week, oftentimes with overlapping periods, for example, weekly offer, weekend offer and special branch offer. When a purchase is made for an item on a purchase date, and there are overlapping offer periods for that purchase date, the lowest offer price is chosen as the purchase price. An ItemOffer table from existing data was proposed: ItemOffer (ItemNo, ItemDescription, OfferlID, OfferStartDate, OfferEndDate, NonOfferPrice, OfferPrice, ItemStockLevel, ReceiptNo, purchaseDatetime, QtyPurchased) (a) Formulate and list the functional and multi-valued dependencies. (b) Draw a dependency graph and propose candidate key(s) for the table ItemOffer.
Normalise the table to BCNF and 4NF by applying the BCNF approach. Show how you apply the steps to arrive at the tables and at each iteration, explain whether each derived table is already in BCNF and 4NF (if applicable). Indicate also whether each (c) MVD is subsumed. (d) Assemble your tables and constraints clearly. Give each table in this form: TABLE-NAME(col-namei, col-namez, .., col-name,) Indicate (PK) against the primary key and (FK) against the foreign keys, if any. Referential integrity constraint(s), if any, together with the child table in this form: TABLE-NAMEX.col-namex1 ...col-namexn must exist in TABLE-NAME..col-namey1.….col-nameyn
Transcribed Image Text:Normalise the table to BCNF and 4NF by applying the BCNF approach. Show how you apply the steps to arrive at the tables and at each iteration, explain whether each derived table is already in BCNF and 4NF (if applicable). Indicate also whether each (c) MVD is subsumed. (d) Assemble your tables and constraints clearly. Give each table in this form: TABLE-NAME(col-namei, col-namez, .., col-name,) Indicate (PK) against the primary key and (FK) against the foreign keys, if any. Referential integrity constraint(s), if any, together with the child table in this form: TABLE-NAMEX.col-namex1 ...col-namexn must exist in TABLE-NAME..col-namey1.….col-nameyn
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