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There is no error-checking function in Layout mode. To test an expression, you must preview the report.
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Two messages refer to the use of an aggregate function in a report item. The same message displays twice because the expression you just added contains two instances of ReportItems. Since the textbox is in a table in the report body and not in a page header and footer, you cannot use the Sum function in its expression. The other two messages refer to the use of grouping scope with report items. Here the message displays twice but references the two report items, Margin and Sales Amount, separately. In this case, the error is caused because the expression belongs to an item positioned in a summary row but references an item in a detail row. To avoid this error, the report item expression in this textbox can refer only to another textbox that is in the table footer. 7. Click the Layout tab, click the Sales Amount cell in the table footer, and then change the Name property to SalesAmount_Total in the Properties window. 8. Click the Margin cell in the same row and change its Name property to Margin_Total. 9. Enter the following expression for the last cell of the table footer:
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=ReportItems!Margin_Total.Value/ReportItems!SalesAmount_Total.Value
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This expression uses the summarized value of Margin divided by the summarized Sales Amount. Importantly, the report item expression refers only to textboxes in the same grouping scope the table footer and does not use the aggregate function. The referenced textbox values for Margin_Total and SalesAmount_Total are already aggregated, so there s no need to apply another aggregate function. 10. Click the Sales Amount cell in the table1_Category footer, and then change the Name property to SalesAmount_Category. 11. Click the Margin cell in the same row and change its Name property to Margin_Category. 12. Add the following expression to the Margin % cell in the table1_Category Footer:
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=ReportItems!Margin_Category.Value/ReportItems!SalesAmount_Category.Value
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13. Click the Sales Amount cell in the table1_SubCategory Footer, change the Name property to SalesAmount_SubCategory, and then click the Margin cell in the same row and change its Name property to Margin_SubCategory. 14. Add the following expressions to the Margin % cell in the table1_SubCategory footer:
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=ReportItems!Margin_SubCategory.Value/ReportItems!SalesAmount_SubCategory.Value
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15. Save the solution, and then preview your report. The top of your report looks like this:
The margin percentages are now correctly displayed in the report.
Using Aggregate Functions
When you add a field to a table, the group footer rows in the table use the default aggregate function, Sum, with that field to total the rows in each group. The same function is also used to calculate a grand total for the table in the table footer. In the report body, an aggregate function operates on a set of rows defined by an expression, such as a field, and returns a value,
Part II:
Authoring Reports
such as a total. Usually, an aggregate function operates on numeric values, but some aggregate functions work with string values. In the page header and page footer, an aggregate function can operate only on report item expressions. Because the expressions in the report body are evaluated when the report is processed, an aggregate function in the report body has access to the dataset and thus can use a field expression as an argument. However, expressions in the page header and footer are evaluated after the report body is processed and before the report is rendered. If you try to use =Sum(Fields! SalesAmount.Value) in the page footer, the report will not compile. Here s where a report item expression comes to the rescue, because it can access information for the processed page and return a value that is displayed in the rendered page. Thus, you can use =Sum(ReportItems! SalesAmount.Value) to total the value of all the textboxes labeled SalesAmount on the page. Reporting Services supports 14 standard aggregate functions, which are shown in the following table:
Use this aggregate function Aggregate Avg Count CountDistinct CountRows First Last Max Min StDev StDevP Sum Var VarP To do this Aggregate values as defined by the data provider Average nonnull numeric values in the set Count values in the set Count the distinct values in the set Count the number of rows in the set Get the first value in the set Get the last value in the set Get the highest value in the set Get the lowest value in the set Find the standard deviation of all nonnull numeric values in the set Find the population standard deviation of all nonnull numeric values in the set Total the numeric values in the set Find the variance of all nonnull numeric values in the set Find the population variance of all nonnull numeric values in the set
These functions are typically used in footer rows of a table or a matrix, but can also be used in free-standing textboxes.
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