What is the difference between weak entity and sub type

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veerbahadur

  • Dec 24th, 2008
 

Weak entity means- existence depends on existence of another entity (example: Employee: Dependant)
SubType related to a SuperType with unique attributes - Specialization,Subtypes are said to Inherit characteristics from its SuperType.

gakorde

  • Oct 5th, 2010
 

Weak Entity is entity dependeant on other entity.

Subtypes are data types inherited from basic data types in Oracle. we can specify additional constraint on subtype while defining them.

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hafiz rafaqat

  • May 31st, 2014
 

what is the difference bw time stamp and subtype discriminator?

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