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Datasheet view to check your progress, instead of running the query Showing the results in Datasheet view doesn t actually run the query and carry out the intended action, so no data is changed
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C AUTION The Editing group in the Advanced set of options in the Access Options list contains
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three Confirm options, one of which is Action Queries By default, this option is checked, so Access always asks for confirmation before carrying out an action query You can clear this option to prevent the display of the confirmation box, but doing so is risky Running a query inform from the Navigation Pane, even an action query, is so easy If you clear the Confirm option, you won t even be warned when an action query is about to run
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Update queries are used to change one or more field values in many records at once You can add criteria that screen the records to be changed, as well as update records in more than one table Update queries can use most types of expressions to specify the update Table 9-1 shows some examples For example, in the Home Tech Repair database, several bids have expired but can be renewed To renew the bids, the costs must be increased slightly to reflect inflation and a new expiration date must be set This involves finding records in the Bid Data table whose Expires date is before August 15, 2007, for example, and then making changes to the related Workorders table to increase the Material Cost and Labor Cost values If no corresponding work order record exists, the update query doesn t change the Expires value because the
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Update query Makes global changes to fields in a group of records For example, you can run an update query to raise all the labor costs for jobs in a certain area of the city Append query Adds a group of records from one or more tables to the end of other tables For example, if you consolidate another contractor s business with your own, you can append his customer list to your own Delete query Deletes a group of records from one or more tables For example, you can use a delete query to delete records for completed work orders Make-table query Creates a new table from data in one or more existing tables For example, you can archive outdated information into a new table or make a backup copy of an important table relationship is defined as an inner join Be sure to include one of the identifying fields in the query, so you can tell which records are going to be updated To create this update query, start a new query design with the Bid Data and Workorders tables, and then do the following: 1 On the Design tab in the Query Type group, click the Update command You can also right-click the table pane, point to Query Type, and choose Update Query from the shortcut menu A new row, Update To, appears in the grid 2 Drag the Bid Number and Expires fields from the Bid Data field list and Material Cost, and Labor Cost fields from the Workorders field list to the grid 3 Enter the expression <8/15/2007 in the Criteria row in the Expires column to limit the records Access adds the pound sign (#) date delimiters 4 Enter the following update expressions in the Update To cells: Bid Number in the Bid Number column Access adds quotation marks [Expires]+90 in the Expires column [Material Cost]*105 in the Material Cost column
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Field Type Currency Currency Date Text Text Yes/No TABLE 9-1 Expression [Material Cost]*105 [Workorders][Material Cost] +[Workorders][Labor Cost] #8/25/2007# Completed WO &[Design] Yes
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