Entity-Relationship (ER) Diagrams - Northeastern University

Entity-Relationship (ER) Diagrams Lecture 7 February 11, 2018 Entity-Relationship (ER) Diagrams 1. CS3200 –Database Design Spring 2018 Derbinsky Outline 1. Context ... Social Security number (SSN), street address, salary, (gender), and birth date. An employee is

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Examples of UML use case diagrams - online shopping ...

Airport check-in and security screening business model. Purpose: An example of a business use case diagram for airport check-in and security screening.. Summary: Business use cases are Individual Check-In, Group Check-In (for groups of tourists), Security Screening, etc. - representing business functions or processes taking place in an airport and serving needs of …

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This post was updated in August of 2018 with new information and examples. Remember the definition of a public good is something that is non-rival, and non-excludable. Non-rival means that if one person consumes a good, that good can still be consumed by someone else. For example, a radio station, just because I am listening to a radio station doesn't mean that someone else …

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The price of petrol falls from P to Pl' Since petrol and cars are in joint demand, demand for cars will tend to increase, and their price rises from R to R I • 11. Price falls. Prices of all goods in a group of substitutes move in the same direction. 12. Prices will rise. 13. The price of …

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Above is an example of a Sequence Diagram of an Online Shopping Cart. Starting from the top, you can see that the actor of the diagram will be the customer that logs in to the e-commerce website and adds an item to the shopping cart in order to complete the purchase. Let's take a look at the diagram and try to understand how the task is completed in the system.

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B. Price times quantity produced must be equal to or greater than total variable cost for some level of output or the firm will close down in the short run. C. Price may be equal to, greater than, or less than average total cost. D. Price must be equal to or greater than minimum average variable cost for the firm to continue producing.

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$2.85 to purchase and smuggle a pack from South Texarkana ($1.00 price per pack + $1.85 smuggling cost per pack), this diagram illustrates a situation in which a North Texarkanan would be better off smuggling rather than purchasing cigarettes in North Texarkana. a. In the accompanying diagram, the demand in North Texarkana is less inelastic.

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Classification of Manufacturing Costs and Expenses

The flow of cost diagram is shown in Figure 4.4. The term, variable cost, then primarily refers to the manufacturing costs that are reflected in the inventory accounts: materials, work in process, and finished goods. The term, variable expenses, refers to …

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Again, suppose the price of clothing is $30, her income is $9,000, and she purchases 100 clothing items. If the price of clothing rose 1 percent to $30.30, she would purchase 99 clothing items, a 1 percent reduction.

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Entity Relationship Diagram (ERD) | ER Diagram Tutorial

There are three basic elements in an ER Diagram: entity, attribute, relationship. There are more elements which are based on the main elements. They are weak entity, multi valued attribute, derived attribute, weak relationship, and recursive relationship. Cardinality and ordinality are two other notations used in ER diagrams to further define ...

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When China's clothing industry expands, the increase in world supply lowers the world price of clothing. a. Draw an appropriate diagram to analyze how this change in price affects consumer surplus, producer surplus, and total surplus in a nation that …

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Online Shop System Use Case Diagram Report (Demo)

initial use case diagram <> Courier Company Online Shop System Maintain Product Catalog Setup Promotion List Send Promotion Email Marketing Staff Collect Return Item Deliver Items Process Order Process Return Sales Staff Check Order Status Maintain Account Information Return Item Customer Place Order Place Order

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