Which one of the following is used to represent the supporting many-one relationships of a weak entity set in an entity-relationship diagram ?Marks : 1Negative Marks : 0Answer hereDiamonds with double/bold borderRectangles with double/bold borderOvals with double/bold borderOvals that contain underlined identifiers
Question
Which one of the following is used to represent the supporting many-one relationships of a weak entity set in an entity-relationship diagram ?Marks : 1Negative Marks : 0Answer hereDiamonds with double/bold borderRectangles with double/bold borderOvals with double/bold borderOvals that contain underlined identifiers
Solution
The correct answer is "Diamonds with double/bold border". In an entity-relationship diagram, a diamond shape is used to represent a relationship. A double or bold border on this diamond indicates that the relationship is a supporting many-one relationship for a weak entity set.
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A weak entity set in an E-R diagram is an entity set that:Marks : 1Negative Marks : 0Answer herehas a primary keymust be part of a one to many relationship setis not existence dependent on a dominant entitymust not participate as owner in an identifying relationship with another entity set
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