Clever Queries: Crafting MDX Queries to get the ... - Data Inspirations

Professional Association for SQL Server

Clever Queries: Crafting MDX Queries to get the Most out of SSRS Erika Bakse @BakseDoesBI erikasblog.datainspirations.com

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Outline • • • • •

MDX Query With Clause Named Sets Calculated Members Think Outside the Cube!

MDX Query • The basic structure of the mdx query • NB: In SSRS queries the columns MUST be measures

Basic Query Syntax

SELECT ON COLUMNS, ON ROWS FROM WHERE

With Clause • Where the fun happens! • Create sets, members, measures

With Clause Syntax Add as many calculations as you need in WITH clause

WITH MEMBER Measures.MyMeasure AS SET MySet AS SELECT ON COLUMNS, Reference ON ROWS calculations directly FROM or indirectly on columns or rows WHERE or in WHERE clause

Named Sets WITH MEMBER MemberName AS SET MySet AS SELECT ON COLUMNS, ON ROWS FROM WHERE

Named Sets • • • •

Set expression assigned to an alias Can be used throughout query wherever a set is usable Improve readability Simplify query changes

Demo: Named Sets

Calculated Members WITH MEMBER MemberName AS SET MySet AS SELECT ON COLUMNS, ON ROWS FROM WHERE

Calculated Members • MemberName is the fully qualified name of the calculated member, including the dimension • Commonly used to create calculated measures • Can really be defined as just about anything…

Demo: Dummy Members

Demo: Think Outside the Cube!

Resources • Creating Named Sets http://msdn.microsoft.com/enus/library/aa216742(v=sql.80).aspx • Creating Calculated Members http://msdn.microsoft.com/enus/library/aa216747(v=SQL.80).aspx • MDX Essentials, William Pearson http://www.databasejournal.com/features/mssql/article.ph p/1495511/MDX-at-First-Glance-Introduction-to-SQLServer-MDX-Essentials.htm

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