generate code 39 barcode java Creating a Data Source Query Subject from the Actions Menu in Microsoft Office

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Creating a Data Source Query Subject from the Actions Menu
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When you create a query subject from the Actions | Create menu, the New Query Subject screen appears Within this screen, shown in Figure 15-9, you can enter the name of the new query subject, and, more importantly, you can select the type of query subject you want to create: Model, Data Source, or Stored Procedure The next screen you see will depend on your selection of the type
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NOTE You cannot change the type of a query subject once it is created, so make sure you select the
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right type for the query subject you are creating when prompted by the New Query Subject screen
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Select the option to create a Data Source Query Subject If you are following our convention on naming data source query subjects, you will want to name it the same as the table you are going to pull in, assuming it is a simple table
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FIGURE 15-9 New Query Subject screen
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FIGURE 15-10
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New Query Subject Wizard - Select Data Source
After you click OK, you need to select the data source The screen in which you select the data source, shown in Figure 15-10, is similar to the screen that appears when you use the Metadata Wizard Note that the Run Database Query Subject Wizard checkbox is checked We will go through that wizard first, and then return to this screen to discuss clearing the checkbox and creating the new data source query subject without a wizard Proceed by choosing the data source from which you want to pull the data and click Next, which opens the Select Columns screen In the Select Columns screen, shown in Figure 15-11, you can choose the tables or just the columns that you want from the Database Objects pane and put them in the Included Columns pane in one of the following, equivalent ways: Select the tables and/or columns, and then click the right arrow button in the middle of the dialog Drag-and-drop the desired tables and/or columns from the Database Objects pane to the Included Columns pane Double-click the desired tables and columns in the Database Objects pane
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To remove an included column, you can do one of the following equivalent operations: Select the columns you want to remove in the Included Columns pane, and then click the left arrow button in the middle of the dialog Select the columns you want to remove and then press the DELETE key Double-click an item in the Included Columns pane You can change the order that your included columns appear in the query subject by selecting an item and using the up and down arrows on the right of the dialog Once you re finished choosing data, click Next to open the Select Joins screen In Figure 15-11, we selected columns from both the PRODUCT_LINE and PRODUCT_ TYPE tables Usually, we would select columns from only one table, but selecting from two related tables will better illustrate the subsequent screens The Select Joins screen, shown in Figure 15-12 lets you define how the tables from which you selected the columns are related If you selected columns from only one table, you would just click Next without defining any joins However, in this case we need to relate the PRODUCT_LINE and
PART IV
FIGURE 15-11
Select Columns screen
Part IV:
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FIGURE 15-12
Select Joins screen
PRODUCT_TYPE tables You can see in Figure 15-12 that the join expression is defined as being when the PRODUCT_LINE_CODE from each of the tables is equal The New Query Subject Wizard suggested this join The wizard attempts to detect which columns might relate from the source tables that are referenced You can manually create joins by double-clicking column names in the upper pane This will automatically insert the columns into the Join Expression pane You can type directly into the Expression line to complete an expression or to add a new one Use the up and down arrows to arrange the individual expression lines and the And/Or part of the Join Expression to link each individual expression logically to create the full expression Alternatively, you can click the Edit button to type in the entire join expression You can also have the wizard try to detect joins for you If you click Suggest, you will see a list of likely joins Select the checkbox next to each part of the expression that you want to include, as shown in Figure 15-13 The selected expressions will be included in the full Join Expression The purpose of the screens shown in Figures 15-12 and 15-13 is to help you write the join criteria that will be used only in the definition of the data source query subject you are creating As mentioned, most of the data source query subjects that you create will include columns only from a single source table In that case, you do not need to create joins in the query subject Whether you determined your joins or just skipped through this section, click Next to continue to the Select Filters screen
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