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Checking a New Table Validation Rule
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Checking a proposed new field validation rule is simple. But what about making a change to a table validation rule Typically, a table validation rule compares one field with another, so to check a new rule, you ll need more complex criteria in your query. There s already a table validation rule in tblFacilityRooms in the HousingDataCopy.mdb sample database. The rule makes sure that the weekly rate is not more than 7 times the daily 250
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Creating and Working with Simple Queries rate it wouldn t be much of a discount if it were! Suppose you now want to be sure that the weekly rate reflects a true discount from the daily rate. Your proposed new rule might make sure that the weekly rate is no more than 6 times the daily rate if an employee stays a full week, the last night is essentially free. Your new rule might look like the following:
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([DailyRate]*6)>=[WeeklyRate]
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So, you need to write a query that checks the current values in the WeeklyRate field to see if any will fail the new rule. Note that you could also create an expression to calculate DailyRate times 6 and compare that value with the WeeklyRate value. When the expression you want to test involves a calculation on one side of the comparison with a simple field value on the other side of the comparison, it s easier to compare the simple field with the expression. Remember, you need to create the converse of the expression to find rows that won t pass the new rule. You can start with the query you built in the previous section or create a new query. You need at least the primary key fields from the table as well as the fields you need to perform the comparison. In this case, you need to compare the current value of WeeklyRate with the expression on DailyRate. Let s turn the expression around so that it s easier to see what you need to enter in the query design grid. The expression looks like this:
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[WeeklyRate]<=([DailyRate]*6)
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To test the converse on the WeeklyRate field s Criteria row of your query, you need either:
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>([DailyRate]*6)
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Not <=([DailyRate]*6)
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Your test query should look like Figure 7-28.
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Figure 7-28. Creating a query to test a new table validation rule.
Part 2: Building a Microsoft Access Desktop Application
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Part 1: Part Title
Microsoft Office Access 2003 Inside Out If you run this query, you ll find that all the rows in the table fail the new test. When I loaded sample data into the table, I created weekly rates that are approximately 6.4 times the daily rate so none of the rates pass the new test. In 9 you ll learn how to create an update query to fix both the daily and weekly rates to match the new rules discussed in this section.
Part 2: Building a Microsoft Access Desktop Application
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Working in Query Datasheet View
When you re developing an application, you might need to work in table or query Datasheet view to help you load sample data or to solve problems in the queries, forms, and reports you re creating. You might also decide to create certain forms in your application that display information in Datasheet view. Also, the techniques for updating and manipulating data in forms are very similar to doing so in datasheets so you need to understand how datasheets work to be able to explain to your users how to use your application. If you re using Access as a personal database to analyze information, you might frequently work with information in Datasheet view. In either case, you should understand how to work with data editing, and the best way to learn how is to understand viewing and editing data in Datasheet view. Before you get started with the remaining examples in this chapter, open ContactsDataCopy.mdb from your sample files folder. In that database, you ll find a query named qryContactsDatasheet that we ll use in the remainder of this chapter. I defined this query to select key fields from tblContacts and display a subdatasheet from tblContactEvents.
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