The following is a description of some data requirements for a chain of hypermarkets.  (a)   A company manufactures one or more cakes, and each cake is manufactured and marketed by exactly one company. (b)   Cakes are sold in hypermarkets. Each hypermarket  has a unique identification. Every hypermarket sells one or more cakes, but some hypermarkets do not sell every cake. (c)   Cake sales must be recorded by invoice, which are kept as a record by the hypermarket. An invoice clearly identifies the cake, chief, and customer, as well as the date it is filled. (d)   Chief produces cakes for customer. A Chief can produce one or more cakes for a customer and a customer can get one or more invoices, but a invoice is written by only one chief. (e)   Cake manufacturer companies may have long-term contracts with hypermarkets and a hypermarket can contract with zero, one, or more companies. Each contract is uniquely identified by a contract number.  Draw the appropriate entity-relationship (E-R) diagram. Clearly show all cardinality constraints, cardinality limits, and existence dependencies.

Practical Management Science
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ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
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The following is a description of some data requirements for a chain of hypermarkets.

 (a)   A company manufactures one or more cakes, and each cake is manufactured and marketed by exactly one company.

(b)   Cakes are sold in hypermarkets. Each hypermarket  has a unique identification. Every hypermarket sells one or more cakes, but some hypermarkets do not sell every cake.

(c)   Cake sales must be recorded by invoice, which are kept as a record by the hypermarket. An invoice clearly identifies the cake, chief, and customer, as well as the date it is filled.

(d)   Chief produces cakes for customer. A Chief can produce one or more cakes for a customer and a customer can get one or more invoices, but a invoice is written by only one chief.

(e)   Cake manufacturer companies may have long-term contracts with hypermarkets and a hypermarket can contract with zero, one, or more companies. Each contract is uniquely identified by a contract number.

 Draw the appropriate entity-relationship (E-R) diagram. Clearly show all cardinality constraints, cardinality limits, and existence dependencies.

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