Consider the table below. Assume it is final and will never be changed.

Which of the following proposed functional dependencies apply (are correct) given this table? Select all that apply.

Question

Consider the table below. Assume it is final and will never be changed.

Which of the following proposed functional dependencies apply (are correct) given this table? Select all that apply.

BlackTom AI · Accepted Answer

First, we need to evaluate the proposed functional dependencies using the given table.
Option 1: Branch -> Phone
- Check that all rows with the same Branch have the same Phone value. For Branch Lansing, there is only one row with Phone 1234, so no conflict.
- For Branch Syracuse, there are two rows and both show Phone 5678, so the dependency holds for this branch as well.
- For Branch Ithaca, there is a single row with Phone 1234, which is consistent with the rule.
- Since every occurrence of a Branch value maps to a single Phone value across all rows, Branch -> Phone is satisfied by this table.

Option 2: Customer_ID -> Name
- Look at each Customer_ID and see if the Name is unique for that ID. Customer_ID C01 corresponds to Smith in the only row where C01 appears.
- Customer_ID C02 corresponds to Doe in its row, with no conflicting entries.
- Customer_ID C03 appears in two rows, both with the name Lee, so there is consistency.
- Since each Customer_ID consistently maps to a single Name across all rows, Customer_ID -> Name holds for this table.

Summary perspective: Both proposed dependencies do not exhibit any counterexamples in the provided data, so both Branch -> Phone and Customer_ID -> Name are valid functional dependencies for this dataset.

Consider the table below. Assume it is final and will never be changed. Which of the following proposed functional dependencies apply (are correct) given this table? Select all that apply.多项选择题

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