Task: Draw an ERD that shows cardinality relationships among the entities.
When you create your ERD, you'll need to consider the training courses, trainers, corporate clients, students, test results, class schedules, and probably a few more. You'll find it easier if you follow these steps:
1. Identify all the entities. Review your DFDs and verify that we know the people, places, things, or events for which data is collected and maintained.
2. Determine all significant events or activities for two or more entities. You'll need to analyze the business operations and identify the entities and the nature of the relationship between them.
3. Analyze the nature of the interaction. Does the interaction involve one instance of the entity or many? Is the pattern always the same or does it depend on some factor?
4. Prepare the ERD diagram using Microsoft Visio. Study the diagram carefully to ensure that all entities and relationships are shown accurately. Use cardinality notation and include the correct symbols to indicate the nature of each relationship.
Phase IV – System Design
Task: Database Design and Input/output Design
1. Review the ERD created in Phase III of the project. Refine the ERD by creating a new entity for each many-to-many relationship.
2. For each entity, Jesse wants to see table designs in 3NF. Use standard notation format (schema) to show the primary key and the other fields in each table.
3. Create tables using Microsoft Access by following the design of step 2 and enforce the relationships among entities.
4. Use sample data to populate fields for at least three records in each table.
Ok i did phase 2. Now i don't have a clue how to do the above task. Can anybody help me get started or recomend what to do?
To complete the given task, you need to draw an Entity-Relationship Diagram (ERD) that represents the cardinality relationships among the entities mentioned. Here's a step-by-step guide to help you get started:
Step 1: Identify all the entities
Review the provided information and identify all the entities involved. In this case, the entities mentioned are training courses, trainers, corporate clients, students, test results, and class schedules.
Step 2: Determine significant events or activities
Analyze the business operations and identify the significant events or activities that involve two or more entities. Consider how these entities interact with each other. For example, a training course may have multiple trainers, and a student can attend multiple courses.
Step 3: Analyze the nature of interaction
Determine the nature of interactions between entities (one-to-one, one-to-many, many-to-many). Consider if the interaction is dependent on any factors or if it follows a consistent pattern. For instance, a trainer can conduct multiple courses (one-to-many), and a course can have multiple trainers (many-to-many).
Step 4: Prepare the ERD diagram using Microsoft Visio
Use a diagramming tool like Microsoft Visio to create the ERD. Arrange the identified entities as boxes and represent the relationships between them using lines. Include cardinality notation to indicate the nature of each relationship (e.g., 1:1, 1:N, M:N). You may also use the correct symbols for different relationship types (e.g., crow's foot notation).
For Phase IV, Database Design and Input/Output Design, you need to follow these steps:
Step 1: Review the ERD from Phase III
Review the ERD you created in Phase III and refine it by creating a new entity for each many-to-many relationship. Identify entities that represent the junction tables for such relationships and add them to the ERD.
Step 2: Design tables in 3NF
Create table designs for each entity using the standard notation format (schema) to show the primary key and other fields in each table. Ensure that the tables are normalized up to the third normal form (3NF) to minimize redundancy and maintain data integrity.
Step 3: Create tables using Microsoft Access
Using the table designs from step 2, create the tables in a relational database management system (RDBMS) like Microsoft Access. Define the appropriate relationships among tables using primary key and foreign key constraints to enforce the relationships between entities.
Step 4: Populate tables with sample data
To test and demonstrate the functionality of the database, populate fields for at least three records in each table with sample data. This will help you simulate real-life scenarios and ensure that the database design is effective.
Remember to follow proper naming conventions and data type choices for each table and field.
I hope this explanation helps you understand the steps required to complete the given task. Good luck!
Sorry, no "cut and paste" here = only typing it all out.
Sra