Draw the ER diagrams if we have entities as follows: M (m1, m2, m3). This is a strong entity type, with m1 as the primary key. P (p1, p2). This is also a strong entity type, with p... Draw the ER diagrams if we have entities as follows: M (m1, m2, m3). This is a strong entity type, with m1 as the primary key. P (p1, p2). This is also a strong entity type, with p1 as the primary key. W (w1, n2). This is a weak entity type, with n2 as the partial key. Not all records in P participate in relationships. Clearly state any assumptions made regarding the relationships and dependencies between the entities. Illustrate all possible assumptions in the diagram. Deliverable: Please provide a single image of the ER diagrams that visually represents the entities, their attributes, relationships, and any assumptions made. You can create this diagram using hand drawing or software.
Understand the Problem
The question is asking for the creation of an Entity-Relationship (ER) diagram based on specified entities and relationships. It requires the participant to illustrate entities as strong or weak types, identify primary keys, and clarify assumptions about the relationships between these entities.
Answer
Draw M and P as strong entities, W as a weak entity. Use diamonds for relationships and double lines between W and its owner.
To draw the ER diagram, represent M and P as strong entities with rectangular symbols, and W as a weak entity with a double rectangle. Use diamonds to represent relationships, and double lines between W and its owning entity. Illustrate attributes with ovals, and assume M owns W through some relation.
Answer for screen readers
To draw the ER diagram, represent M and P as strong entities with rectangular symbols, and W as a weak entity with a double rectangle. Use diamonds to represent relationships, and double lines between W and its owning entity. Illustrate attributes with ovals, and assume M owns W through some relation.
More Information
Weak entities depend on strong entities (M or P) for their identity, typically represented with double-lined connections. Attributes are depicted as ovals linked to their entities.
Tips
A common mistake is not correctly linking the weak entity to a strong entity with double lines. Ensure relationships are accurately represented and all keys are properly identified.
Sources
- Weak Entity Set in ER diagrams - GeeksforGeeks - geeksforgeeks.org
- Guide to entity-relationship diagram notations & symbols - Gleek.io - gleek.io
AI-generated content may contain errors. Please verify critical information
