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Consider a relation R that has three attributes ABC. It is decom-posed into relations R1 with attributes AB and R2 with attributes BC.
1. State the definition of a lossless-join decomposition with respect to this example. Answer this question concisely by writing a relational algebra equation involving R, R1, and R2.
2. If you are given the following instances of R1 and R2, what can you say about the instance of R from which these were obtained? Answer this question by listing tuples that are de?nitely in R and tuples that are possibly in R.
Instance of R1 = {(5,1), (6,1)} Instance of R2 = {(1,8), (1,9)}
Can you say that attribute B de?nitely is or is not a key for R?
Consider a student club or organization in which you are a member. What are the data entities of this enterprise? List and define each entity.
your database has been a hit. you have been called back to the customers headquarters and they want a detailed report
modify oracle table data using the correct sql statements. you must create the statements in oracle by using the
Did the corresponding lines for invoices 1001 and 1008 in table LINE get deleted automatically? Can you explain why?
part 1 - using the data items given below construct an rea diagram entities participation cardinalities relationships.
Data Modelling (database) require 8 page essay covering the following subjects: Organizational Intelligence. It must specifically talk about organizational intellignece being outcome of organization's efforts.
To analyse a set of data, and write a memo, identifying and explaining your insights into the operation of Todd Restaurants.
Relational database is based on fact that data in one table can be tied, or related to data in another table. To do this, database utilizes various types of keys to form or define these relationships.
Write a SELECT statement which returns three columns: VendorName, InvoiceCount, and InvoiceSum. InvoiceCount is the count of the number of invoices, and InvoiceSum is the sum of the InvoiceTotal column.
Please create a program using Microsoft Access Database. Create a system for Construction Engineering Norms. This objective for this system is to be use by the Project Management to do an estimate for the CONTRUCTION ENGINEERING works.
Don't forget to underline key attributes for entity sets and include arrowheads indicating the multiplicity of relationships
Using example of vehicles and drivers, explain issues to convert relationship for new cardinality including new relationships and attributes for the tables.
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