The GATE Grind

GATE 2020 CS – Question 24

Databases · ER-Model and Database Architecture · 1 mark · Multiple choice

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

  1. Diamonds with double/bold border
  2. Rectangles with double/bold border
  3. Ovals with double/bold border
  4. Ovals that contain underlined identifiers

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Correct answer: (A) Diamonds with double/bold border

Explanation

The identifying (supporting) relationship of a weak entity set is drawn as a diamond with a double or bold border. Weak entity sets themselves are double rectangles.