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Finally, we are left with the attributes in each of our entities Attributes are usually pretty simple Now that you have all your tables modeled, you need to rename the attributes to match your physical naming standards and place them in the correct table If you split or combined some of your entities, the bulk of the work comes in splitting or combining the attributes to the appropriate table One thing to be aware of during this process are your data types Hopefully, your modeling software understood SQL Server types when you built your logical model, and hopefully you took our advice about using the SQL Server types in your logical model If these things are true, then your attribute data types should just copy right into your tables Most of the work of creating your physical model is simple and straightforward Usually your data modeling software allows you to gener-

This sample code illustrates the creation of a TextBox with an initialized editable phone number and two commands

Dim iUpHours, iDownHours iUpHours = InputBox("How many hours has the server " & _ been up " & _ " Fractional numbers are OK") iDownHours = InputBox("How many hours has the server " & _ been down " & _ " Fractional numbers are OK")

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ate a physical model based on your logical model If this is the case, all you have to do is work through any name changes required to match the standards If your modeling software doesn t support physical models, or if you have been building your physical model right inside SQL Server, then you have more work to do It isn t complicated; you just need to start from scratch when it comes to creating your tables All we can say is that, although expensive, good modeling software is worth its weight in gold

[ Team LiB ]

Dim sResult sResult = CalcDownPerc(iUpHours, iDownHours) MsgBox "The server has been down for " & _ sResult & " of the " & _ "time it has been up"

One last thing we want to talk about is the business rules that need to be enforced in your model Many business rules will be set up and managed in the application or in a middle or business tier, but some rules can and should be implemented in SQL Server We do this for two reasons: First, it makes sense to enforce some things, such as constraints on data, in SQL Server; and second, as database developers, architects, and administrators, we don t trust applications Is this just paranoia talking Maybe, but it is still good practice to implement as many business rules as possible in SQL Server To be fair, it isn t only because we don t trust applications; other factors push us in this direction For example, let s say you have a perfect business tier and all the data comes through without failure each and every time; would it then be a good idea to remove all your PKs, FKs, and constraints because the business tier is handling the relationships and data integrity Some people argue that it is, but we disagree What happens if for some reason you need to run a bulk import and you do it without the aid of the business tier You stand to create a lot of integrity problems because of a lack of enforcement in SQL Server Also, certain features of SQL Server, such as transactional replication, require primary keys We are firm believers in using any and all means in your power to maintain data integrity inside SQL Server databases In this section, we look at how to implement business rules using various features of SQL Server and we give examples from the Mountain View Music database for each feature

[ Team LiB ]

Dim sDisplay sDisplay = FormatPercent(iPerc, 4)

Constraints provide a mechanism inside SQL Server to control the data that goes into tables We look at three types of constraints: default, unique, and check constraints Default constraints provide a default value for a

Alerts are Screens that can be used to inform the user about errors and other exceptional conditions Alerts can also be used as short informational notes and reminders For the presentation of longer information, other Screen classes such as Form should be used

An Alert shows a message and an optional Image to the user An Alert is either presented for a certain period of time, or it can be modal with a special user operation to dismiss (close) the Alert

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In this example, FormatPercent() is used to format the contents of variable iPerc so that the result has four digits after the decimal place, and the result may have a leading zero before the decimal depending upon the computer's locale settings Another popular formatting function is FormatDateTime() In the next example, suppose that variable dLastLogon contains a user's last logon date

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