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Entity set TRANSACTION has the attributes transaction number, date, amount. Entity set ACCOUNT has the attributes account number, customer name, balance.
Q. Which is the discriminator of the weak entity?
  • a)
    Account number
  • b)
    Transaction number
  • c)
    {Account number, date}
  • d)
    Date
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Entity set TRANSACTION has the attributes transaction number, date, am...
We can clearly see that transaction is the weak entity with the discriminator (key for weak entity) as transaction number. This discriminator is used to uniquely identify each transaction of a particular account.
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Most Upvoted Answer
Entity set TRANSACTION has the attributes transaction number, date, am...
Explanation:

  • Entity Set: An entity set is a group of similar entities that share common attributes.

  • Weak Entity: A weak entity is an entity that cannot be uniquely identified by its attributes alone. It depends on the existence of a related entity.

  • Discriminator: A discriminator is an attribute of a weak entity that identifies its related strong entity.



In the given scenario, the entity sets are TRANSACTION and ACCOUNT. TRANSACTION has the attributes transaction number, date, and amount. ACCOUNT has the attributes account number, customer name, and balance. As per the question, we need to identify the discriminator of the weak entity.

The discriminator of a weak entity is an attribute that is used to identify its related strong entity. In this case, the weak entity is not mentioned, but we can assume that it is related to ACCOUNT or TRANSACTION. Let's analyze the options given:

a) Account number: Account number is an attribute of the strong entity ACCOUNT. It cannot be used to identify the related weak entity.

b) Transaction number: Transaction number is an attribute of the strong entity TRANSACTION. It can be used to identify the related weak entity.

c) {Account number, date}: This combination of attributes is not related to any entity set.

d) Date: Date is an attribute of the strong entity TRANSACTION. It cannot be used to identify the related weak entity.

Therefore, the correct answer is option B, Transaction number.
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