barcode scanner event c# Extracting Information with Queries in Microsoft Office

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Extracting Information with Queries
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FIGURE 8-4
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Adding a third table to the query design
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Drag the asterisk from the field list to an empty column in the grid This method does the same as the previous one Double-click the field list title bar to select all the fields, and then drag the group to the grid Access places each field in a separate column across the grid in the order in which they appeared in the field list
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TIP Using the asterisk method of adding all the fields to the query can be both an advantage and a
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disadvantage The advantage is this: If fields are added or deleted from the underlying table or query, this query automatically makes corresponding changes to the design The only disadvantage is if you want to sort or filter using one of the fields, it must be added separately to the grid To add a group of fields to the grid at once, select them and drag them as a group The standard use of shift and ctrl to select adjacent and nonadjacent field names, respectively, works here as with filters When you drag the block of selected field names to the grid, Access spreads them to empty columns, beginning where you drop the group If fields are already in the grid, those to the right of where you drop the group move over to make room
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Retrieving and Presenting Information
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To add fields to the grid one at a time, do any of the following: Double-click the field name to place it in the first empty column Drag the field to an empty column or insert it between filled columns Select the field name from the Field row drop-down list (see Figure 8-5) The list in a blank column contains all the fields in all the tables in the table pane, as well as the table names with a period and asterisk Scroll down the list to see more names
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NOTE Fields added to a query inherit the properties from the underlying table or query You can
override some of these field properties in the new query design There is more about this later in the section Changing Field Properties To remove a field from the grid, click the column selector and press del, or in the Query Setup group, click the Delete Columns command If you remove the check mark from the Show cell in a column with no Sort or Criteria entries, the field is automatically removed from the grid the next time you open the query
FIGURE 8-5
Selecting a eld from the list
8:
Extracting Information with Queries
You can adjust the column widths and drag a column to a new position, just as in a datasheet or advanced filter Changing the column width has no effect on the query results datasheet unless you reduce it to zero and the adjustments aren t saved with the query
NOTE You can ask Access to adjust a column width to fit its longest visible entry in the design grid,
which might be the field name or one of the selection criteria Move the mouse pointer to the right edge of the column selector and double-click when the pointer changes to a two-way arrow This sets a fixed column width and, if you enter a longer value in the column later, you ll need to readjust the width to see it all Figure 8-6 shows the new query, still unnamed, with all the required fields in place The columns have been resized to fit their contents and some are off the screen, out of sight When you want to add a multivalued field to a query, you have two ways of displaying it in the query result: All entered values in a single cell in the record row Each value in a separate record row
PART II
FIGURE 8-6
Adding elds to the query design
Part II:
Retrieving and Presenting Information
If you want all the Crew names for one work order to appear in one cell separated by commas, place the Crew field name in the design grid (see Figure 8-7) If you want each Crew name to appear on a separate line, choose CrewValue from the Workorders field list instead
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