Create a single-entity data model for this list

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Reference no: EM131219013

Examine the list of e-mail messages in Figure 5-55. Using the structure and example data items in this list, do the following:

A. Create a single-entity data model for this list. Specify the identifier and all entities.

B. Modify your answer to A to include entities SENDER and SUBJECT. Specify the identifiers and attributes of entities and the type and cardinalities of the relationships. Explain which cardinalities can be inferred from Figure 5-55 and which need to be checked out with users.

C. The e-mail address in the From column in Figure 5-55 is in two different styles. One style has the true e-mail address; the second style (e.g., Tom Cooper) is the name of an entry in the user's e-mail directory. Create two categories of SENDER based on these two styles. Specify identifiers and attributes.

Reference no: EM131219013

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