barcode scanner event c# NOTE If you want to change the data type Access assumes for the field, define a validation rule, or in Microsoft Office

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NOTE If you want to change the data type Access assumes for the field, define a validation rule, or
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change other properties, you must switch to Design view As discussed earlier in this chapter, the commands in the Fields and Columns group offer three special commands: New Field, Add Existing Fields, and Lookup Column New Field Opens the Field Templates pane at the right of the datasheet where you can choose the field template closest to what you need Add Existing Fields Opens the Field List pane where you can choose fields from other tables in the current database Lookup Column Starts the Lookup Wizard
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Part I:
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To delete a column in Datasheet view, click anywhere in the field, and then on the Datasheet tab s Fields and Columns group, click Delete Access warns you that the deletion will be permanent This is one of those times where the Undo button on the Quick Access toolbar doesn t work Choose Yes to go ahead with the deletion or No to cancel You can delete contiguous columns by selecting them and clicking the Delete command
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NOTE You cannot delete a field that s part of a relationship without first deleting the relationship
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Either open the Relationships window to delete the relationship yourself or accept Access s offer to delete it for you
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Changing Field Names
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You already learned how to create a name for a field in Design view You also saw how to give a field a new name when you created a table from a blank datasheet In Datasheet view, you have three ways of renaming an existing column: Double-click the text in the field selector and type in the new name Select the column, and on the Datasheet tab s Fields and Columns group, click Rename Right-click the field selector and choose Rename Column from the shortcut menu All three methods place the insertion point in the field name text where you can replace or edit the existing name In addition, any existing field Caption properties are deleted
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Editing Record Data
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The standard methods of moving around a datasheet or form to edit record data haven t changed much with Access 2007 You use the Go To command in the Find group of the Home tab or the navigation buttons at the bottom of the datasheet or form to move to another record: First, Previous, Next, Last, or New The tab key and the right arrow and left arrow keys can also be used to move to another field To change the entire value in a field, select the field and enter the new value To edit only part of the value, change to Edit mode by clicking in the field or pressing f2 Once in Edit mode, the right arrow and left arrow keys move the insertion point through the characters, instead of among the fields The icons that appear in the record selector at the far left of the datasheet row are the indicators that show the status of the current record: A colored record selector indicates the current record, not in the process of editing A pencil indicates changes are underway in the current record Access saves the changes when you move to another record An asterisk indicates a blank row ready for entering a new record
NOTE A fourth record indicator, a circle with a diagonal line through it the international symbol
meaning Do Not shows the record is undergoing changes and is locked by another user If this appears, you must wait to make your changes to the record
6:
Entering and Editing Data
To Select Characters in a field Entire field Adjacent fields Column Adjacent columns Record Adjacent records TABLE 6-2
Mouse Action Click at the start and drag across the data Click the left edge of the field when the mouse pointer changes to a hollow plus sign Click the left edge of the first field and drag to extend the selection Click the field selector Select the first column and, without releasing the mouse button, drag over the adjacent columns Click the record selector Select the first record and drag over the adjacent records
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