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An integer value between 1 and 255 (Default is 8)
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Why you should not use the Lookup Wizard Wait a minute! What about the Lookup Wizard entry under Data Types I recommend that you never use this wizard. It often builds strange SQL for the Row Source property, it always defines a relationship between the table you re editing and the lookup table, and it defines indexes on both fields. If the lookup table contains only a few rows, the index is a waste of time and resources. As you learned in 4, there s a limit of 32 indexes on a table. I have seen some cases where I haven t been able to build all the indexes I need because the Lookup Wizard built these unnecessary indexes.
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Part 2: Building a Microsoft Access Desktop Application
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Tip When I m designing a combo box that displays multiple columns when dropped down, I always specify a List Width value that s the sum of the Column Width values plus 0.25 inches to allow for the vertical scroll bar.
5
Auto or a specific width
5
Properties That Apply to Combo Boxes Only
5
Part 2: Building a Microsoft Access Desktop Application
Microsoft Office Access 2003 Inside Out
Changing the Primary Key
5 5 5 5 5 5
3, Designing Your Database Application, discussed the need to have one or more fields that provide a unique value to every row in your table. This field or group of fields with unique values is identified as the primary key. If a table doesn t have a primary key, you can t define a relationship between it and other tables, and Microsoft Access has to guess how to link tables for you. Even if you define a primary key in your initial design, you might discover later that it doesn t actually contain unique values. In that case, you might have to define a new field or fields to be the primary key. Let s go back to the three tables we built earlier with the Table Analyzer Wizard. Suppose you discover that users are becoming confused by the fact that ContactTypes_ID is a number instead of the actual text. (See my comments about using the Lookup Table Wizard in the previous section.) You could keep the lookup table to help avoid duplicate values, but there s no reason not to store the actual text value in the Contacts table instead of a linking ID. To fix this, you need to perform the following steps. Be sure to save your work at the end of each step.
1 Open the Contacts table in Design view and insert a new field named ContactType,
data type Text, length 50.
2 Update the new ContactType field with related information from the ContactTypes
table. I ll show you how to do this easily with an update query in 9. For now, you can switch to Datasheet view and copy what you see in the Lookup to ContactTypes field to your new ContactType field. (There are only 18 rows, so this shouldn t take you very long.)
3 Open the Relationships window and click the Show All Relationships button so that
you can see the additional relationships that the Table Analyzer Wizard built. Click on the line between Contacts and ContactTypes and press the Delete key to remove the relationship. (You must delete any relationship involving the primary key of a table before you can change the key.)
4 Open the Contacts table in Design view and delete the ContactTypes_ID field. 5 Open the ContactTypes table in Design view and change the primary key from ID to
ContactType. (You can also select the ID field and delete it if you like.) Access provides several ways for you to accomplish this task. You could open the Indexes window (as you learned in 4), delete the primary key definition, and build a new one. A simpler way is to select the new field you want as the primary key and then click the Primary Key button on the toolbar, as shown in Figure 5-34.
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