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Introduction To MDX

Introduction To MDX. Dustin Ryan. A little bit about me…. Business Intelligence Consultant, Pragmatic Works Technical editor for the many authors at Pragmatic Works Blog/Write @ www.BIDN.com Proficient in magic Part-time belly dancer at I-4 truck stop. About Pragmatic Works….

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Introduction To MDX

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  1. Introduction To MDX Dustin Ryan

  2. A little bit about me… • Business Intelligence Consultant, Pragmatic Works • Technical editor for the many authors at Pragmatic Works • Blog/Write @ www.BIDN.com • Proficient in magic • Part-time belly dancer at I-4 truck stop

  3. About Pragmatic Works… • Located in sunny, stupid hot Green Cove Springs, FL • Offer consulting and training services • Data Warehousing • Data Migrations • DTS Conversions • Software centering around Microsoft B.I. stack • BI xPress • BIDS plugin for SSIS development • BI Documenter • Document reports, packages, cubes, databases • Task Factory • High performance SSIS tasks

  4. What is MDX? • Multi Dimensional eXpression Language • Used to query cubes (multidimensional databases) • Developed during the late 1990’s

  5. Where is MDX used? • Cube calculations • KPI’s • Querying the cube

  6. Why MDX? • Allows complex reporting • Cube answers analytical questions • Data is pre-aggregated DEMO

  7. Useful Terminology • Dimension • A Dimension organizes data in relation to a particular interest • Attribute • Within a dimension are attributes. Attributes are properties of the dimension that describe that area of interest. • Measures • A measure can be summarized as a column that contains some kind of quantifiable data that can be aggregated

  8. More Useful Terminology • Hierarchy • A user defined hierarchy is a hierarchical structure of attributes

  9. A couple more terms… • Level • Within a hierarchy are levels. An example of a level in the Date Hierarchy would be the Month Level. • Member • A member is a value of a level. An example of a member of the Month level would be March or April.

  10. Yet More Useful Terms • Axis • Can be thought of as the line on a which a single dimension rests which intersects our measure groups • An MDX query can have up to 128 axes (only 5 are aliased) • Rows • Columns • Pages • Chapters • Sections • Most MDX queries contain only 2 axes since most reporting is done in a two dimensional tabular format

  11. Basic MDX Query Syntax • MDX Query example: Select[Date].[Fiscal Year].members on Rows, [Measures].[Internet Order Quantity] on Columns From [Adventure Works] Where [Product].[Category].&[1] DEMO

  12. Tuples & Sets • Tuples • A collection of dimension attributes not from the same dimension ex. ([Date].[Fiscal Year].members, [Sales Territory].[Sales Territory Country].members) • Set • A collection of tuplesex. {([Date].[Fiscal Year].&[2006], [Sales Reason].[Sales Reason].&[9]),([Date].[Fiscal Year].&[2006], [Sales Reason].[Sales Reason].&[5])} DEMO

  13. Common MDX Calculations • DEMO DEMO

  14. MDX Books to Check Out • MDX Solutions • Microsoft SQL Server 2008 MDX Step by Step • Practical MDX Queriesby Art Tennick

  15. Contact Me Dustin Ryan • Email: dryan@pragmaticworks.com • Blog: www.BIDN.com/blogs/DustinRyan

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