Create an ERD based on the Crow’s Foot notation with Microsoft Visio, using the following business rules or requirements: An INVOICE is written by aSALEREP. Each sales representative can write many invoices, but each invoice is written by a single sales representative. The INVOICE is written for a single Customer. However, each customer can have many invoices. An INVOiCE can include many detail lines (LINE), each of which describes one product bought by the customer. The product information is stored in a PRODUCT entity. The product's vendor information is found in a VENDOR entity.

Create an ERD based on the Crow’s Foot notation with Microsoft Visio, using the following business rules or requirements: An INVOICE is written by aSALEREP. Each sales representative can write many invoices, but each invoice is written by a single sales representative. The INVOICE is written for a single Customer. However, each customer can have many invoices. An INVOiCE can include many detail lines (LINE), each of which describes one product bought by the customer. The product information is stored in a PRODUCT entity. The product's vendor information is found in a VENDOR entity.

Oracle 12c: SQL

3rd Edition

ISBN:9781305251038

Author:Joan Casteel

Publisher:Joan Casteel

Chapter1: Overview Of Database Concepts

Section: Chapter Questions

Problem 15MC: Which of the following symbols represents an optional relationship in an E-R model? a. a straight...

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Create a full-blown ERD based on the Crow's Foot notation, using the following requirements: 1) An INVOICE is written by a SALESREP. Each sales representative can write many invoices, but each invoice is written by a single sales representative. 2) The INVOICE is written for a single CUSTOMER. However, each customer can have many invoices. 3) An INVOICE can include many detail lines (LINE), each of which describes one product bought by the customer. 4) The product information is stored in a PRODUCT entity. 5) The product’s vendor information is found in a VENDOR entity. Note that M:N relationship (if any) needs to break down to two 1:M relationship. Provide key attributes (less than 7) for each entity.
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Using the Crow’s Foot notation, create an ERD that can be implemented for a medical clinic, using the following business rules:- A patient can make many appointments with one or more doctors in the clinic, and a doctor can accept appointments with many patients. However, each appointment is made with only one doctor and one patient. Emergency cases do not require an appointment. However, for appointment management purposes, an emergency is entered in the appointment book as “unscheduled.” If kept, an appointment yields a visit with the doctor specified in the appointment. The visit yields a diagnosis and, when appropriate, treatment. With each visit, the patient’s records are updated to provide a medical history. Each patient visit creates a bill. Each patient visit is billed by one doctor, and each doctor can bill many patients. Each bill must be paid. However, a bill may be paid in many installments, and a payment may cover more than one bill. A patient may pay the bill directly, or…
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A restaurant chain has several locations in a city (with a name and zip code stored for each), and each is managed by one manager. Each manager manages multiple restaurants. Each restaurant location has its own unique set of menus. Most have more than one menu (e.g., lunch and dinner menus). Each menu has many menu items, items can appear on multiple menus, and each menu has a price on it. A customer can visit multiple restaurants and a restaurant can have multiple customers. Represent this situation of restaurants with an E-R diagram
Q9.Conflicting requirements are common in Requirement Engineering, with each client proposing his or her version is the right one. True False
Which of the following symbols represents an optional relationship in an E-R model?a. a straight lineb. a dashed linec. a straight line with a crow’s foot at both endsd. a straight line with a crow’s foot at one end