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there are sometimes good reasons to back off of BCNF adequate reasons to back off from 3NF when denormali

there are sometimes good reasons to back off of BCNF adequate reasons to back off from 3NF when denormali

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Question While there are sometimes good reasons to back off of BCNF to 3NF, there are never adequate reasons to back off from 3NF when denormalizing. True False Question 6 Consider the following model: ZipLocation zipcode: String - ciyName String - staneName Sting 1.1 Contact -lasame String - frstame String emat String Say that we created a table structure that retained the ZipLocation table, but additionally cloned the cityName, and stateName into Contact so that we could avoid performing a join between Contact and Ziplocation when we were reporting out from the Contacts table. There are several ways that we can make sure that Contact stays in sync with ZipLocation. Pick the three options that would work: V Add a before update trigger to Contact that would look at the other rows in Contact with that same zip code to make sure that they all agree on cityName and stateName. OAdd a before update trigger to Contact that updates the data in ZipLocation if anything changes in Contact for a particular zipcode. O Add a before update trigger in Contact that would copy down the new values of cityName and stateName if the zipCode changes in Contact. O Add a before update trigger in Contact that would ignore any changes to cityName and stateName and just quietly restore the original values if the user tries to change them.
Transcribed Image Text:Question While there are sometimes good reasons to back off of BCNF to 3NF, there are never adequate reasons to back off from 3NF when denormalizing. True False Question 6 Consider the following model: ZipLocation zipcode: String - ciyName String - staneName Sting 1.1 Contact -lasame String - frstame String emat String Say that we created a table structure that retained the ZipLocation table, but additionally cloned the cityName, and stateName into Contact so that we could avoid performing a join between Contact and Ziplocation when we were reporting out from the Contacts table. There are several ways that we can make sure that Contact stays in sync with ZipLocation. Pick the three options that would work: V Add a before update trigger to Contact that would look at the other rows in Contact with that same zip code to make sure that they all agree on cityName and stateName. OAdd a before update trigger to Contact that updates the data in ZipLocation if anything changes in Contact for a particular zipcode. O Add a before update trigger in Contact that would copy down the new values of cityName and stateName if the zipCode changes in Contact. O Add a before update trigger in Contact that would ignore any changes to cityName and stateName and just quietly restore the original values if the user tries to change them.
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