Part 2 in .NET framework

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Part 2
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The top of your report looks like this:
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The margin percentages are now correctly displayed in the report.
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Using Aggregate Functions in a Data Region
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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 up 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, 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 13 standard aggregate functions, which are shown in the following table:
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5
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Working with Expressions
Use this aggregate function Avg
Count CountDistinct CountRows First Last Max Min StDev StDevP Sum Var VarP
To do this
Average non-null 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 non-null numeric values in the set Find the population standard deviation of all non-null numeric values in the set Total the numeric values in the set Find the variance of all non-null numeric values in the set Find the population variance of all non-null 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 freestanding textboxes. Two running aggregate functions are often used in detail rows to display accumulating values. The running aggregate functions are shown in the following table:
Use this running aggregate function RowNumber
RunningValue
To do this
Show the current row count in an accumulating count of rows in the set Show the current value in an accumulating aggregation of the set
How to Use Aggregate Functions in a Report
Even though the Sum aggregation function is added by the Report Designer as you drop a field into a header or footer row of a table, you can also type an aggregate function directly into the table for example, when you need to show cumulative values in the detail rows of a report or display averages in the footer row.
Abbrev. Title
Working with Expressions
Part 2
Authoring Reports
Aggregates can also be used outside a data region in a freestanding textbox, either in the report body or in the page header or footer. For example, you might want to show a grand total on the first page of a report or display a page total in the footer of each page. In the case of non-numeric data, such as an employee directory, you might want to show the first and last employee name in a page footer.
Abbrev. Title
Using Aggregate Functions in a Table
When using aggregate functions in a data region, such as a table, you need to consider the scope of the function. Scope in the context of a data region determines which rows are included when calculating the aggregated value. Scope can refer not only to a grouping in the data region, but also to an entire data region or even to an entire dataset. Most aggregate functions use the syntax Function(Expression,Scope), but the RunningValue function is constructed using the following syntax: RunningValue(Expression,Function,Scope). In this function, Expression cannot itself contain an aggregate function; Function is the aggregate function to apply (which cannot be RunningValue or RowNumber); and Scope is the name of data region or a grouping in a data region and is encased in quotation marks. In this procedure, you use the RunningValue function to show how many products in a subcategory contribute to 80 percent of product sales in each subcategory.
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