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The first issue in this list refers to the field ID. In Access, this field is called an auto increment field because each time you add another record to the table, Access automatically increments by one the value used when it added the last record and uses this new value for the new record. While SharePoint will accept the values from this column when it converts the table to a SharePoint list, if your Access table has gaps in the auto increment field values (because you deleted items after creating the table entries), these gaps are closed in the generated SharePoint list. In other words, if you had a short list of 10 items and deleted item 5 from the Access table before uploading the table to SharePoint, SharePoint renumbers the items to fill in the gap using values from 1 through 9 rather than 1 through 10. It then will use 10 for the next value added in SharePoint.

I will not spend a lot of time talking about each of these controls here. You can find excellent coverage of many of these controls in the book Pro InfoPath 2007 by Philo Janus (Apress, 2007). Before I give you a step-by-step list of what you must do to re-create the Request for Absence Report featured in this chapter, let s look at some of the properties of the controls available to you when building an InfoPath form. First, to view the properties of any control, right-click the control after adding it to the form (you can double-click or click and drag the control to position it on the form within a table). From the drop-down menu, select the Properties option at the bottom of the list. The check box and option button controls have an interesting property that many may not suspect if they are familiar with these types of controls from other programming languages. When you add a check box control to a form, you would expect that each check box would support a Boolean value of True or False or perhaps the integer variation on this of 1 or 0. However, you if open the Properties dialog box and select the Data tab, you can change the data type associated with the check box. Notice that the control supports several different types of values ranging from text, to integers, to dates, to even hyperlinks. You still can only save two values, and both values must have the same data type. However, if you would rather save one of two possible dates, depending on whether the user selects the option, or one of two possible decimal values, you can. Figure 9-5 shows an example where a check box returns the

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Every table in relational databases should have a primary key Most relational systems do not allow you to update existing individual data records without a primary or unique key to identify which record to update When possible, you should always use existing table fields to create a natural key However, at the same time, you should avoid long natural keys or keys that require the concatenation of many individual fields One solution to long keys uses a created key called an autonumber field Access uses this field type to create a unique integer field for each record You should add this field to the table schema before adding any records to the table.

discount to be applied to a sale depending on whether the user clicks a check box asking whether the buyer has a frequent buyer card. In this case, the frequent buyer card holder gets an extra 10%.

In addition, only one field per table can be an auto increment field, and you cannot set a field to be auto increment after you defined the table even if you have not added data to the table The start value for a new table typically begins with 1, and each record added to the table increments this value by 1 While you can no longer use your own increment value in Access, you can use a Random value for the ID However, a random generated ID value does not translate to SharePoint the same way as an auto increment will While the ID field does transfer, it will not generate a new random ID for new values added in SharePoint If you delete a record, the database does not reuse that number In addition, auto increment fields generally cannot be edited.

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