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Consider the following data:
What is the primary key of the weak entity?
  • a)
    {account number, date}
  • b)
    {transaction number, date}
  • c)
    {account number, transaction number} 
  • d)
    {account number}
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Consider the following data:What is the primary key of the weak entity...
Weak entity is an entity which does not have sufficient attributes to form the primary key. It is always dependent on a strong entity. Here, transaction is the weak entity because no transaction is possible without an account. Thus, the primary key of the weak entity is represented as: {account number, transaction number}.
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