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Let R be decomposed into R1, R2, ..., Rn. Let F be a set of FDs on R.
1. De?ne what it means for F to be preserved in the set of decomposed relations.
2. Describe a polynomial-time algorithm to test dependency-preservation.
3. Projecting the FDs stated over a set of attributes X onto a subset of attributes Y requires that we consider the closure of the FDs. Give an example where considering the closure is important in testing dependency-preservation, that is, considering just the given FDs gives incorrect results.
Exceptions in credit card transactions can aid us fraudulent use of credit card. Suggest two methods for outlier detection.
database management system create a database design specification enhanced entity relationship diagram eerd and
In each task, please feel free to make any assumption necessary for the readers. The explanation of your assumptions can help the readers to understand what you have considered differently but as important criteria in producing your model.
Indicate changes you require to make to design of Premiere Products database to support following situation: There is no relationship between customers and sales reps.
Create a state transition diagram that describes typical student states and how they change based on specific actions and events.
Draw a decision tree that describes the merchandise inventory management process.
Complete (i.e., reverse engineering) ER diagram below such that 4 relation schemas above are exactly result of a translation from the ERD to the relational model.
Illustrate all the data in each of four tables. Don't show foreign key columns. Write down the names and e-mail addresses for all customers who have had stove repair which cost more than $50.
Imagine you are a senior systems administrator who has recently been given the task to help improve security of your company's IT infrastructure after a series of network security breaches.
The DBA denormalized some of the data in Premiere Products database to enhance performance, and one of the resulting tables is following.
Why do you believe that views by themselves are insufficient for protecting access by unauthorized users?
question accountants will use data flow diagrams dfds to depict the physical flows of data through an ais like document
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