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Explain what you understand by the following terms:
i. Query Evaluation ii. Query optimization
Discuss the ways or strategies you can apply to improve the query performance
Prove that Armstrong’s Axioms are sound and complete for FD in-ference. That is, show that repeated application of these axioms on aset F of FDs produces exactly the dependencies in F+.
Design relation schemas for the entire database.
Explain the following terms brie?y: attribute, domain, entity, relation-ship, entity set, relationship set, one-to-many relationship, many-to-many relationship, participation constraint, overlap constraint, covering constraint, weak entity set, aggre..
vehiclerentaloz data warehousevehiclerentaloz is a large chain of vehicle rental company over 500 stores distributed
Create and run the following sql queries and submit the screen shot of your result. Also submit the file lab_06_03. sql
You subsequently realize that updates to these relations are frequent. Because indexes incur a high overhead, can you think of a way to improve performance on these queries without using indexes?
write a two-page executive summary for your boss explaining how a relational data solution can be applied to a current
question 1research the definition of a minimal cover. explain it in your own words and give an example. question
Identify the Functional Dependencies in R. Be sure to maximize the number of attributes on the right hand side (RHS) and minimize the number of attributes on the left hand side (LHS) of each FD. You should exclude any trivial FDs in your answer.
Using the information given above, create a set of relational tables that are normalized to BCNF.
problem 1. produce a scatterplot of rent vs. size square meters of the apartment for the rental data in
Write a join query that for every order placed on September 5, 1998, (use '05-SEP-1998') will list the order number and order date along with the customer number, last name, and first name of the customer who placed the order
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