Question-11

Which one of the following is used to represent the supporting many-one relationships of a weak entity set in an entity-relationship diagram?

• Diamonds with double/bold border
• Ovals with double/bold border
• Ovals that contain underlined identifiers
• Rectangles with double/bold border

Answer

• Diamonds with double/bold border
• Ovals with double/bold border
• Ovals that contain underlined identifiers
• Rectangles with double/bold border

Solution

• A double/bold diamond represents the relationship between a strong entity set and a weak entity set.
• Ovals with double/bold borders typically denote multivalued attributes.
• Ovals containing underlined identifiers often signify key attributes.
• Rectangles with double/bold borders usually represent weak entity sets sets.