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Data Structures and Algorithms
Consider the following E-R diagram O b. 1:N O C. N:M O d. M.N firstName elD ssn name lastName skills Employees dateOfBirth age N WorksIn 1 In the Worksin relationship type, Employees :Departments:is of cardinality ratio O a. N:1 dName location did budget Departments

Consider the following E-R diagram O b. 1:N O C. N:M O d. M.N firstName elD ssn name lastName skills Employees dateOfBirth age N WorksIn 1 In the Worksin relationship type, Employees :Departments:is of cardinality ratio O a. N:1 dName location did budget Departments

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### Understanding E-R Diagram: Employees and Departments #### E-R Diagram Explanation The Entity-Relationship (E-R) diagram illustrates the relationships between two entities: **Employees** and **Departments**. **Entities:** 1. **Employees**: - Attributes: - `firstName` - `lastName` - `ssn` (Social Security Number) - `eID` (Employee ID) - `skills` - `name` - `dateOfBirth` - `age` (depicted with a dashed oval, suggesting it's a derived attribute) 2. **Departments**: - Attributes: - `dName` (Department Name) - `location` - `did` (Department ID) - `budget` **Relationship:** - **WorksIn** - **Cardinality**: The relationship denotes that one department can have many employees (`1:N` relationship), as indicated by 'N' on the side of Employees and '1' on the side of Departments. #### Multiple-Choice Question The question asks for the cardinality ratio of the `WorksIn` relationship between **Employees** and **Departments**. **Options:** a. N:1 b. 1:N c. N:M d. M:N **Correct Answer:** b. 1:N This explains that an employee works in one department, but a department can have multiple employees. ### Key Points for Educational Context: - The E-R diagram is a vital tool in database design. - Understanding attributes and their relationships is crucial for designing efficient databases. - Cardinality is essential for modeling real-world relationships accurately within databases. This diagram and explanation help students visualize and comprehend the structure and relationships within an organization's data.
Transcribed Image Text:### Understanding E-R Diagram: Employees and Departments #### E-R Diagram Explanation The Entity-Relationship (E-R) diagram illustrates the relationships between two entities: **Employees** and **Departments**. **Entities:** 1. **Employees**: - Attributes: - `firstName` - `lastName` - `ssn` (Social Security Number) - `eID` (Employee ID) - `skills` - `name` - `dateOfBirth` - `age` (depicted with a dashed oval, suggesting it's a derived attribute) 2. **Departments**: - Attributes: - `dName` (Department Name) - `location` - `did` (Department ID) - `budget` **Relationship:** - **WorksIn** - **Cardinality**: The relationship denotes that one department can have many employees (`1:N` relationship), as indicated by 'N' on the side of Employees and '1' on the side of Departments. #### Multiple-Choice Question The question asks for the cardinality ratio of the `WorksIn` relationship between **Employees** and **Departments**. **Options:** a. N:1 b. 1:N c. N:M d. M:N **Correct Answer:** b. 1:N This explains that an employee works in one department, but a department can have multiple employees. ### Key Points for Educational Context: - The E-R diagram is a vital tool in database design. - Understanding attributes and their relationships is crucial for designing efficient databases. - Cardinality is essential for modeling real-world relationships accurately within databases. This diagram and explanation help students visualize and comprehend the structure and relationships within an organization's data.
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What is option 1. Is it a. N:1?

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