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It 163

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Submitted By ladyjojo72
Words 392
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Course No. IT 163
Student Name: Suzette Samuel
Instructor Name: Anthony Stabile
Date: October 26, 2007
Unit 10 – Final Project

Part 1 1. The major goals of a database designer are to properly design a database that provides you with access to up-to-date and accurate information and also to prevent unnecessary duplication of data. One of the basic advantages of the database design is that it helps identify research gaps. All data is stored in one place where it’s easy to find, it’s also designed to be a multimedia system. A correct design is essential to achieving your goals. 2. A null value is that there is no value at all; an absence of a data and it’s not really the same as a zero. Why it’s not the same as a zero because a zero is a zero balance the null value is that its non-data, a data that is not present right now. The three interpretations for a null value are SQL-unknown value, true and false. 3. A switchboard is a form that includes buttons to perform a variety of actions. It is important to a database designer because it ensure users that they can switch between tables, report, and forms by viewing them. What it can do is that access displays a switchboard on which the users’ clicks a button to indicate the table that they want to view. What it can not do is switch between programs. 4. I think that general managers like in a bank should have access to certain tables in the database while other users are “blocked” from that same data. It won’t be right if both have access to the same data because there are personal data the other user should not see or use. For the college example I think the dean of school should have access to that kind of information. 5. Define referential Integrity; Referential integrity is a database concept that ensures that relationships between tables remain consistent. It is possible for a customer not to have a sales rep number, but it is not possible for a customer to have an INVALID sales rep number. An example; this is where foreign keys comes in, a customer should be assigned to a number of that sales rep, there should be a relationship between the two.

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