DBMS-Entity Relationship (E-R) Model

DBMS-Entity Relationship (E-R) Model
11. The participation is optional if an entity's existence requires the existence of an associated entity in a particular relationship.
  • TRUE
  • FALSE
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12. An entity type does not have an independent existence
  • TRUE
  • FALSE
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13. An attribute is viewed as the atomic real world item.
  • TRUE
  • FALSE
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14. Domains can be composed of more than one domain.
  • TRUE
  • FALSE
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15. The degree of a relationship is the number of entities associated or participants in the relationship.
  • TRUE
  • FALSE
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16. The connectivity of a relationship describes a constraint on the mapping of the associated entity occurrences in the relationship.
  • TRUE
  • FALSE
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17. In case of mandatory existence, the occurrence of that entity need not exist.
  • TRUE
  • FALSE
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18. An attribute is property of an entity or a relationship type.
  • TRUE
  • FALSE
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19. In E-R diagram, if the attribute is simple or single-valued then they are connected using a single line.
  • TRUE
  • FALSE
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20. In E-R diagram, if the attribute is derived then they are connected using double line.
  • TRUE
  • FALSE
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