Entity relationship diagram and relational database creation xacc 210

ACC MENTOR Redefine the Possibl

entity relationship diagram and relational database creation xacc 210

View Notes - Week 5 Entity Relationship Diagram from ACC at University of Phoenix. Address Address City City First Name First Name State State Last. For more courses visit ACC Week 1 DQ 1 ACC Week 1 DQ 2 ACC Entity Relationship Diagram and Relational Database Creation ACC FOR MORE CLASSES VISIT ddttrh.info . Week 5 Individual Assignment Entity Relationship Diagram and Relational Database Creation.

What possible reasons can you provide for what might have gone wrong. Provide as many possibilities as you can think of 2. Far Eastern is experiencing a very large increase in the number of machines that they should repair.

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What problems might Far Eastern experience because of this increase in repairs? Provide as many possibilities as you can think of. Two customers of Far Eastern were talking to each other. One customer found that he was charged more for his repair than the other person, even though the machines were very similar.

What reasons can you suggest for the difference in prices between the two repairs? Customers of Far Eastern are not happy when the actual repair price is higher than the estimated repair price. The sales person says that it is not his fault because the estimation is so difficult. Provide as many possibilities as you can think of that make the accurate estimation of the total cost of a repair difficult.

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entity relationship diagram and relational database creation xacc 210

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entity relationship diagram and relational database creation xacc 210

In the School table, there are two columns - id and name. A primary key is capable in uniquely defining records in a table. In other words, there must not be two or more school records that share the same id.

Tutorial: Entity Relationship Diagrams - PowerPoint PPT Presentation

Student, another table, has a foreign key column, namely SchoolId. It is a reference to the primary key Id in the School table. Note that foreign keys need not be unique. Multiple student records can share the same School ID. In a real world scenario, there can be multiple students studying at the same school and therefore have the same school id. Between the School and Student entities, there is a connector.

Illustration on ER Model to Relational Tables- 1 - Database Management System

We call it a relationship. In this case, it is a one-to-many relationship. It means that the entity with the primary key i. School contains only one record that associates with zero, one or many records in the referenced entity i.

We can describe the relationship in everyday language by saying: A school intakes many students. Relational Database Design with ERD If the database you are going to build consists of a few tables only, you do not need to design it at all.

entity relationship diagram and relational database creation xacc 210

You can simply use the management tools provided by the database management system, or run a few SQL statements to get the database built. However, this would hardly be the case in real world. If you are planning a database with more than 10 tables, or even up to hundreds of tables, it would be better to consider designing the database prior to building it.

entity relationship diagram and relational database creation xacc 210

Here are some of the benefits of database design: It provides a means for you to study the data structure, to make sure necessary tables and relationships are well included.

In addition, well-designed database leads to efficient data addition and retrieval.

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  • How to Design Relational Database with ERD?

During the design process, you can understand not only the data structure but also the target system can be better. This helps your team to develop the rest of the system.

How to Design Relational Database with ERD?

Assume you have recently developed a system. Three years later your client has updated the business plans and strategies and request you to upgrade the existing database to fulfill the new requirements. It would be a pain to plan and execute changes by looking into the database to study the table definitions. Database design always gives you a clear picture of what you have done. Database design is not just for you. It also allows your clients to review and comment on your work.