Question: Double Line indicate_____
Answer:
Double lines are used in ER diagram to indicate that the participation of an entity set in a relationship set is total: that is each entity in the entity set occurs in at least one relationship in that relationship set. For example consider the relationship borrower between customers and loans. A double line from loan to borrower indicates that each loan must have at least one associated customer.
MCQ: Double Line indicate_____
Explanation:
Double lines are used in ER diagram to indicate that the participation of an entity set in a relationship set is total: that is each entity in the entity set occurs in at least one relationship in that relationship set. For example consider the relationship borrower between customers and loans. A double line from loan to borrower indicates that each loan must have at least one associated customer.
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Related Questions
- 1. Double Rectangle represent_____
- 2. Consider the entity relationship which consists of two entity sets, customer and loan, related through a binary relationship set borrower. A directed line(->) from the relationship set borrower to the entity set loan specified that borrower is either a_________ or _______ relationship.
- 3. Consider the entity relationship which consists of two entity sets, customer and loan, related through a binary relationship set borrower. An undirected line (--) from the relationship set borrower to the entity set loan specifies that borrower is either a __________ or __________relationship set from customer to loan.
- 4. An Edge between a entity set and a binary relationship set can have an associated minimum and maximum cardinality, shown in the form of l and h, where l is the minimum and h is the maximum cardinality. What a minimum Cardinality value of 1 indicates?
- 5. An Edge between a entity set and a binary relationship set can have an associated minimum and maximum cardinality, shown in the form of l and h, where l is the minimum and h is the maximum cardinality. What a Maximum Cardinality value of 1 indicates?
- 6. An Edge between a entity set and a binary relationship set can have an associated minimum and maximum cardinality, shown in the form of l and h, where l is the minimum and h is the maximum cardinality. What a Maximum Cardinality value of * indicates?
- 7. An entity set may not have sufficient attributes to form a primary key; such an entity set is termed as______
- 8. An entity set that has attributes to form a primary key; such an entity set is termed as______
- 9. For a weak entity set to be meaningful, it must be associated with another entity set called the ___________
- 10. Which of the following statements stands true? I.A Relational database consists of collection of AttributesII.A Relational Database consists of collections of TablesIII.A relational Database consists of collections of ColumnsIV.A relational Database consists of collections of Rows
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