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Databases can enforce business rules on permissible values by implementing declarative constraints in the database. These include NOT NULL, CHECK, UNIQUE, REFERENTIAL INTEGRITY, and PRIMARY KEY constraints. Are these constraints that we are talking about easy to implement in an Access Database?
What are triggers used for, and why are they important in database systems? Provide an example of a situation where a trigger would be appropriate.
VSS has an existing software package that controls its high bay systems and wants to rewrite it. The existing system is written in C and uses C-ISAM files to store data.
Suppose that we replace the wait and signal operations of monitors with a single construct await(B), where B is a general Boolean expression. Write a monitor using this scheme to implement the readers--writers problem.
Create a function that returns the day of the week for a specified date. Create a trigger that displays the message "Emp table updated" when an update to the employee table increases the employee's basic salary.
The database application project (DAP) for this course consists of the creation of a fully functional Microsoft Access database application for a real client.
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.
Using your knowledge of the college environment, determine the functional dependencies that exist in the following?
Design an updateable database for storing customer and sales data. Explain how to deal with the problems of missing data.
Design a scheme for determining exactly which one of the wine bottles was poisoned in just one month's time while expending O(logn) taste testers.
Explain how you will visually represent the data for the sales of the individual stores and for the time period shown. You want to show the change in sales for each store over time for the past three years.
A Relational schema of your database in 3NF, clearly indicating attributes, the data type of each attribute, primary and foreign keys, candidate keys, and which attributes are nullable, giving reasons. List any assumptions you need to make.
Use Cases Perform a requirements analysis for the Case Study
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