Clearly differentiate between primary keys (PK) and foreign keys (FK) using proper notations.

use these guidelines to improve my eerd using draw.io
To improve this ERD (Entity Relationship Diagram), here are some suggestions:
1. Primary and Foreign Key Representation:
Clearly differentiate between primary keys (PK) and foreign keys (FK) using proper notations.
Example: Use underlines or bold for PKs and italics for FKs.
Example:
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Order
———
Order ID (PK)
Customer ID (FK)
2. Relationships and Cardinalities:
Add relationship cardinality (one-to-one, one-to-many, many-to-many) to clarify connections.
For instance:
A Customer can place many Orders → 1:N
An Order consists of multiple Menu Items → M:N
Use symbols like:
1 for “one”
N for “many”
Example:
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Customer (1) ——– (N) Order
3. Normalization:
Ensure all tables are normalized (e.g., no unnecessary redundancy or repeating groups).
If Order includes Item #, consider a separate OrderDetails table for many-to-many relations:
OrderDetails (Order ID, Item ID, Quantity)
4. Descriptive Table Names:
Menu Item could be renamed to MenuItem for consistency and to avoid spaces.
Likewise, Ingredient could include clearer fields if needed.
5. Attributes Clarification:
Ensure each table only has relevant attributes.
Example:
Supplier table has Ingredient → This could indicate a normalization issue. A supplier supplies an ingredient, so a junction table might be better.
Suggested Tables:
Supplier (Supplier ID, Name)
Ingredient (Ingredient ID, Name, Quantity)
SupplierIngredients (Supplier ID, Ingredient ID)
6. Relationships with Labels:
Use more descriptive labels for relationships:
Example: “Places” could be “Places Order”
“Completes” could be “Fulfills Order”
7. Diagram Layout:
Arrange the tables in a logical flow:
Place Customer on the left → leading to Order → then connect to Menu Items and Ingredients.
Use consistent spacing and alignment.
8. Optional Notations:
Use Crow’s Foot Notation or UML Notation for relationships, as it’s widely recognized.
Sample Improvements in Layout:
Customers → Orders → Menu Items
Orders → Employees (Completing Orders)
Menu Items → Ingredients → Suppliers
Would you like me to demonstrate this improved layout or normalization? I can sketch the changes for clarity.

 

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