Building Advanced Reports in Visual Studio .NET

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Its hierarchical structure simplifies user navigation. An OLAP database can respond to queries faster than a relational database because it uses this hierarchical structure to store precalculated aggregations. An OLAP database uses sophisticated analytical formulas on the server, particularly time series analysis such as year-over-year comparisons. Many commercial software companies have developed client tools that allow a user to perform interactive analysis directly with the OLAP database. Still, using Reporting Services to access OLAP data using an MDX query has two main advantages. First, you can provide a simple implementation of a thinclient solution when the majority of users don t need flexible analysis but do want access to the results of server-based calculations. Second, you can reduce the execution time of a report compared with retrieving the same data from a relational source.
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How to Use Recursive Hierarchies
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Reporting Services includes several features that support recursive hierarchies. The first feature allows you to group records in a recursive hierarchy so that data can be organized appropriately in a data region. The second feature is the Level function for expressions. Once you ve established a recursive hierarchy through grouping, you can use the Level function to expose how far the current record is from the top of the hierarchy. This feature is handy for formatting data according to its position within the hierarchy. The third feature is the Recursive keyword, which you can use with functions to aggregate members of a hierarchy by group.
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Displaying a Recursive Hierarchy in a Data Region
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To add a recursive hierarchy to a data region, you need to modify the data region s grouping properties. The group expression must be the field expression that identifies the unique records in the hierarchy. Then, you specify a parent group expression that identifies the parent records. For example, in a table that describes the organizational relationship between employees and managers, each employee record has a key column to uniquely identify the employee and a
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Another hierarchical structure that Reporting Services can access is an Analysis Services online analytical processing (OLAP) database. Analysis Services, like Reporting Services, is bundled with SQL Server. Analysis Services is a server-based OLAP engine that structures data to facilitate fast and powerful queries that would be challenging to reproduce with traditional relational queries. Creating an OLAP database has three main benefits:
Part 2
Authoring Reports
parent key column that points to the parent record the employee s manager in the same table. You can group employees by manager using these key columns and perform aggregations of values within these groupings, such as counting employees by manager or totaling the employees salaries. In this procedure, you will add a grouping level to a table for a recursive hierarchy that has employees as unique records and supervisors as parent records.
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Define a parent group for a recursive hierarchy
In Solution Explorer, right-click the Reports folder in the project My Adventure Works, point to Add, and then click Add Existing Item to add the Employee Salaries.rdl saved in the C:\rs2000sbs\chap07 folder. Double-click the Employee Salaries.rdl report to open it in the Document window, and then click the Preview tab to confirm the top of the report looks like this:
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You ll be changing this report to group employees by supervisor. Click the Layout tab, click the table, and then click the detail row to select the row. In the Properties window, click the Ellipsis button for the Grouping property. In the Details Grouping dialog box, type RecursiveGroup as the name. Click =Fields!EmployeeKey.Value from the Expression list.
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Building Advanced Reports
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Click the OK button. 9 Click the table, right-click the table handle in the top left corner, and then click Properties. 10 Click the Sorting tab. 11 Click =Fields!Salary.Value in the Expression list box, click Descending in the Direction list box, and then click the OK button. 12 Save, and then preview the report at a zoom factor of 75 percent to check the results. Now employees are sorted in groups by supervisor, and sorted within the group by salary in descending order. However, the layout still doesn t clearly distinguish supervisors from employees.
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