Querying with MDX in C#.NET

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Querying with MDX
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An MDX query statement is different from an MDX expression. An expression is a formula that calculates a single value. A query is a command that populates a report with many values from a cube. The cube browser in the Cube Designer, like many client applications used with Analysis Services, generates MDX queries to retrieve values from the cube. You can use these tools to create reports without writing any MDX queries of your own. Unless you re a developer creating a custom report generator, you ll probably have little occasion to write MDX query statements. So, why should you learn how to create an MDX query statement The most interesting MDX expressions involve creating a single result based on a large set of values from a cube. Those expressions, in effect, create a subquery behind the scenes. Learning how to create an MDX query will enable you to understand clearly what the subquery is doing when you create complex MDX expressions. The purpose of an MDX query is to extract values from an OLAP cube into a report. While a cube has dimensions, a report does not. It has axes (typically, a row axis, a column axis, and a filter axis). An axis can include labels from more than one dimension. A cube contains all possible values for all members of all attribute hierarchies of all dimensions. A report contains only selected values from selected levels of selected attribute hierarchies of selected dimensions. An MDX query statement consists of the instructions for extracting a report from a cube.
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SQL Server Management Studio provides an interface for you to type an MDX query, run it, and see the results in a grid. The MDX query window includes a metadata pane, which allows you to browse the hierarchies and members of a cube, inserting dimension, attribute, and member names into the MDX expression.
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If you write Structured Query Language (SQL) queries, you ll recognize the clauses used to create an MDX query: SELECT, FROM, and WHERE. The SELECT clause defines which members to include and where to place them on rows or columns. The FROM clause names the cube, and the optional WHERE clause restricts values returned by the query to specific members. In this procedure, you ll execute MDX queries to become familiar with the SQL Server Management Studio query interface and MDX query syntax. Use SQL Server Management Studio to execute MDX queries 1. Start SQL Server Management Studio, click Cancel, click the Open File button, navigate to the C:\Documents and Settings\<username>\My Documents\Microsoft Press \as2005sbs\chap08 folder, double-click MDX Queries.mdx, and then click Connect to connect to the Analysis Server. 2. If necessary, select SSAS Step by Step in the Available Databases drop-down list on the toolbar, and click SSAS in the Cube list box in the MDX Query window. Your screen looks like this:
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In the MDX Query window, the SSAS cube metadata displays on the left in the metadata pane, where you inspect information in a selected cube. The MDX queries display on the right in the query pane. Several MDX queries have been saved in this one file for convenience. They can be executed together the way you can execute a series of SQL queries if you insert the GO command between queries. The bottom pane, which will appear after you execute an MDX query, is the results pane, which shows the output of an MDX query. Notice that you can add a comment to an MDX query simply by entering two adjacent slash characters (//), and MDX will ignore everything from that point to the end of the
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