ISDS 3110 Final Exam Guide Questions & Answers 2024/2025
0 view 0 purchase
Course
ISDS 3110
Institution
ISDS 3110
ISDS 3110 Final Exam Guide Questions & Answers 2024/2025
Pattern Match Search Condition - *LIKE / NOT LIKE* - ANSWERS*%*
- Represents any sequence of zero or more characters (wildcard)
*_*(underscore)
- Represents any single character
Subqueries - ANSWERSA query within a query
*Mult...
ISDS 3110 Final Exam Guide Questions
& Answers 2024/2025
Pattern Match Search Condition - *LIKE / NOT LIKE* - ANSWERS*%*
- Represents any sequence of zero or more characters (wildcard)
*_*(underscore)
- Represents any single character
Subqueries - ANSWERSA query within a query
*Multi-Table Join with Selection Predicates* example.
List the fname and lname of clients who are registered in branches in 'London'. - ANSWERS*SELECT
DISTINCT* c.fName, c.lName *FROM* Client c, Registration r, Branch b *WHERE* c.clientNo = r.clientNo
*AND* r.branchNo = b.branchNo *AND* b.city = 'London'
Motivation for Normalization - ANSWERSProblem 1. Data Redundancy
Problem 2. Update Anomalies
Update Anomaly - ANSWERSRelations that contain redundant information may potentially suffer from
update anomalies
Types of Update Anomalies - ANSWERS- *Insertion* anomaly
- *Deletion* Anomaly
, - *Modification* Anomaly
Solution to Avoid Update Anomalies - ANSWERSDecomposition
Decomposition must satisfy 2 properties: - ANSWERS1. *lossless-join* property
- enables us to find any instance of the original relation from corresponding instances in the smaller
relations
2. *Dependency Preservation* Property
- Enables us to enforce a constraint on the original relation by enforcing some constraint on each of the
smaller relations
Purpose of Normalization - ANSWERS*Normalization* is a *database design technique* for *producing*
a *set of suitable relations* that support the data requirements of an enterprise
Characteristics of a suitable set of relations - ANSWERSa. *The minimal number of attributes* necessary
to support the data requirements of the enterprise
b. attributes with a close logical relationship are found in the same relation
c. *Minimal data redundancy* with each attribute represented only once with the important exception
of attributes that form all or part of foreign keys
Benefits of Normalization - ANSWERSa. Easier for the end user to access and maintain the data
b. Take up minimal storage space on the computer
Functional Dependencies - ANSWERSIf *A* and *B* are attributes of relation R
*B* is *functionally dependent* on *A* (denoted A -> B) If each value of *A* in R is *associated* with
*exactly one *value of *B* in R
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Bensuda. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.99. You're not tied to anything after your purchase.
