A weak entity is defined as one that does not meet the requirements of any of the two criteria listed above. Give an example of a weak entity.
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A weak entity is defined as one that does not meet the requirements of any of the two criteria listed above.
Give an example of a weak entity.
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- What distinguishesa weak entity from a strong entity that has a required relationshipto another entity?Why are weak and strong entity sets different?The cardinality ratio depends on the real-world meaning of the entity types involved and is defined by the specific application. For the binary relationships below, suggest cardinality ratios based on common-sense meaning of the entity types. Clearly state any assumptions you make. Entity 1 Student Cardinality Ratio Entity 2 Course Item Class Teacher TextBook wwwwwwwwwww Order Instructor
- Can you identify what each weak entity in this diagramPrepare an Entity Relationship Diagram for the application described in the following paragraph. Pick and Shovel Construction Company is a multi-state building contractor specializing in medium-priced town homes. Assume that Pick and Shovel’s main entities are its customers, employees, projects and equipment. A customer can hire the company for more than one project, and employees sometimes work on more than one project at a time. Equipment, however, is assigned to only one project at a time. Draw an ERD showing those entities.Create an ER Model for the following requirements: A car has a make, model and year. A registration has a county and date. A person has an address and an age. A car may be owned by a person. A car may be registered to an owner. Explain your reasoning behind 1 choice you made between in the ER diagram in question 1. For example, why choose entity vs relationship, or weak entity vs ternary relationship, or use/disuse of an aggregation, or similar choices.