Project ForgeDatabase Management Systems
Relational Model & ER Basics
GATE 2020
Easy
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
- BRectangles with double/bold border
- COvals with double/bold border
- DOvals that contain underlined identifiers
Explanation
In standard ER-diagram notation, a weak entity set's identifying (supporting) relationship — which is always many-to-one toward the strong owner entity — is drawn as a diamond with a double/bold border, paired with the weak entity set itself drawn as a rectangle with a double/bold border.
Source: GATE CS 2020 (2020)
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