barcode generate in asp net 18: Getting Started with Access Databases in Microsoft Office

Drawing QR Code in Microsoft Office 18: Getting Started with Access Databases

CHAPTER 18: Getting Started with Access Databases
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In Access, saving is a little bit different than it is in other Office products Access requires that you save only the objects you create It will prompt you to do so when you close that object after creating or modifying it Unlike Word, Excel, and PowerPoint, in which you must manually save data entered with the Save command, Access saves data entered for each record after you leave that record So, Access saves your data for you automatically
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More Table Properties
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Most Access objects have myriad properties that could be written about for hours on end If you decide to become an Access expert, you will have to become familiar with many of these properties Because you re not yet an expert and might never want to be, we ll discuss only three more field properties All three Format, Decimal Places, and Caption can be set on the General tab in table Design view (see Figure 18-5) For more in-depth coverage of Access, try a book such as Microsoft Office Access 2003: The Complete Reference by Virginia Andersen (McGraw-Hill/Osborne, 2003)
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FIGURE 18-5
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Setting the Format, Decimal Places, and Caption properties
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How to Do Everything with Microsoft Office 2003
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The Caption property allows you to set a description for each field as it will appear on a form, report, or as a column heading in Datasheet view If you don t set a Caption property, the field name is used Enter Last Visit as the caption for the VisitDate field in the ClientVisits table of the Pantry database and you will see Last Visit as the description for that field wherever it appears throughout the database Make sure that the correct field is selected in the Field Name column before you change a property The Format and Decimal Places properties go together The Format property applies to all data types except OLEObject and determines how data in a field will appear For certain number field Format properties, the Decimal Places property sets the number of decimals that will display Access Format properties are similar to Excel Format properties The Percent format adds a percent sign to a number, the Currency format adds a dollar sign, and so on Choose the format you want for your numbers and that format will apply to the field wherever it appears in your database The following steps explain how to change the Caption and Format properties for a field in the Pantry database If you choose to ignore setting these properties for a field, you will have to set them every time you use that field on a form or report In this case, a little more work upfront can save hours of work later on 1 Open the ClientVisits table in Design view 2 In the Field Name column, select the VisitDate row 3 On the General tab in the Field Properties section, click in the Format row Select the Short Date format 4 Click the Caption row and type Last Visit 5 Close the table 6 Choose Yes when prompted to save Figure 18-6 shows the resulting table in Datasheet view Formatting a number in a field does not change the actual number itself, only how that number appears throughout the database So, formatting the number 314 to zero decimal places displays the number only as 3 However, any calculations performed on the number will use its actual value of 314
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Manually Setting the Primary Key
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Sometimes you will need to change or add a primary key after a table has been created This is done in table Design view Remember, setting a primary key improves query performance, so most tables should have one, especially those that will be queried often By setting a field as the primary key, you are telling Access that no two records in the table will contain duplicate information in that field So, make sure you select a field that will be unique to each record If you don t, Access will not allow you to enter certain records in the table
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