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When a student has not chosen a major at a university, the university often enters a value of "Undecided" for the major field. Is "Undecided" a way to represent the null value? Should it be used as a default value? Justify your answer carefully.
Create mission statements and mission objectives for database systems explained in the following case study EasyDrive School of Motoring. Also in mission objectives include 10 reports that the database system must support
Create a report which identifies five most expensive bicycles. The report must list bicycles in descending order from most expensive to lease expensive, the quantity on hand for each, and the markup percentage for each.
it is not essential to give violations which have more than one attribute on right side. Decompose the relation, as essential, into collection of relations which are in BCNF.
What is lock granularity? Explain the use of BEGIN, COMMIT, and ROLLBACK TRANSACTION statements. Explain the meaning of expression ACID transaction.
Identify two possibly mispriced bond issues, one overpriced and one underpriced. and graph the bond yield to maturity (YTM) on the y-axis of an XY-scatter plot, with the bond to maturity in years on the x-axis.
Artificially small example of B+ tree is shown here (pdf). (Note only part of tree is shown in detail.) What nodes of example B+ tree are visited to find posting list for "dune"?
Based on the information in the Bike Mania case study, use a suitable CASE tool or drawing package to draw up a set of diagrams showing the current physical view of the systemusing the unified modeling language (UML 2.0) notation
Write down the advantages and disadvantages of working with multiple tables? Write an example of situation where multiple tables would be suitable in the application.
The relations given below keep track of airline flight information:Flights(flno: integer, from: string, to: string, distance:integer, departs: time, arrives: time, price: real)Aircraft(aid: integer, aflame: string, cruisingrange: integer)
Create a query that spans both tables. Eliminate redundant fields. Modify the Query to select only those Customers that had service dates in October and November 2006.
Data Modeling and Normalization
Explain efficient algorithm that, provided edge-labeled graph G with distinguished vertex v0 and sequence s = σ1, σ2, ..., σk of characters from Σ, returns path in G which begins at v0.
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