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You might want to hide CY 2006 because there are no reseller sales for that year Here we have Non Empty before the column specification
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-- hiding nulls select non empty {[Date][Calendar][Calendar Year],[Date][Calendar]} on columns, {[Product][Product Categories][Category],[Product][Product Categories]} on rows from [Adventure Works]
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Practical MDX Queries for Microsoft SQL Ser ver Analysis Ser vices 2008
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To show or hide null values is a business decision The result might look better without CY 2006 Then again, it might be important to know that 2006 sales are null (or empty or zero) If you were to browse a cube as a pivot table in Excel 2007, BIDS, or SSMS, the empty cells are hidden by default although there are options to display them This is the opposite behavior to the MDX query editor, which shows empty cells by default
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Here, a Where slicer is used to change to Internet Sales Amount from the default Reseller Sales Amount that was used implicitly in the last query
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Syntax
-- different measure select {[Date][Calendar][Calendar Year],[Date][Calendar]} on columns, {[Product][Product Categories][Category],[Product][Product Categories]} on rows from [Adventure Works] where [Measures][Internet Sales Amount]
Result
C h a p t e r 1 : H e l l o W o r l d : E a s y Ye t E f f e c t i v e Q u e r i e s
Analysis
The column and row headings (captions) remain the same However, the values in the cells have changed The cell at the bottom-right corner is now about 29 million dollars and not about 80 million dollars
Hiding Nulls Again
Here we have the last query in this introductory Hello World chapter It tidies up the previous query by using Non Empty on both axes to hide null values
Syntax
-- hiding nulls again select non empty {[Date][Calendar][Calendar Year],[Date][Calendar]} on columns, non empty {[Product][Product Categories][Category], [Product][Product Categories]} on rows from [Adventure Works] where [Measures][Internet Sales Amount]
Result
Analysis
Non Empty is used twice on the columns and on the rows CY 2006 has gone as before But Components has disappeared from the rows too CY 2001 and Clothing both survive the use of Non Empty even though they have null values in some of their cells Non Empty operates on the whole column (or row) and not on part of the column (or row) Thus CY 2001 is still there as there is a non-null value ($3,266,37366) for the sales of Bikes in that year
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2
Astrophysical: Playing with Dimensions
Practical MDX Queries for Microsoft SQL Ser ver Analysis Ser vices 2008
his chapter shows you how to work with dimensions, hierarchies, levels, and members It s quite possibly the most difficult chapter in the whole book especially if you are not familiar yet with the concepts of dimensions and hierarchies Understanding them is vital if you want to write meaningful and powerful MDX Key concepts Multiple-hierarchy dimensions, attribute hierarchies, user hierarchies, displaying members Keywords Select, Columns, Rows, members, Crossjoin
Single-Hierarchy Dimension
The Sales Channel dimension contains just the one attribute, also called Sales Channel Even though it is simply an attribute (probably a source column in a star schema relational database), it is also a hierarchy By default, all attributes have an All level back in the dimension design in BIDS Attribute hierarchies are represented as blue rectangles composed of six small squares in the Metadata pane of the query editor window If a dimension should contain just the one attribute, it will not normally include any user-defined hierarchies, which usually require at least two attribute hierarchies to create two or more separate levels (in addition to the All level at the top) However, it is technically possible to create a user-defined hierarchy from a single attribute
Syntax
-- single-hierarchy dimension select [Sales Channel] -- dimension on columns from [Adventure Works]
Result
Analysis
Here only the dimension is specified for the Columns axis By default, it returns the default member of the attribute hierarchy Usually, the default member is at the All level
2: Astrophysical: Playing with Dimensions
of the dimension s attribute hierarchy The default member can be changed in BIDS If there is no default member, the member at the All level is typically chosen The default member in this hierarchy (at the All level) has had its AttributeAllMemberName set to All Sales Channels in BIDS The figure of $80,450,59698 is for the default measure in the cube (DefaultMeasure property back in BIDS) Here, it is Reseller Sales Amount
Multiple-Hierarchy Dimension 1/2
Single-hierarchy dimensions are quite rare Usually, a dimension will have two, and often more, attributes (strictly speaking, we should call them attribute hierarchies) In addition, many dimensions in a cube design have user hierarchies that are composed of two or more attribute hierarchies We will look at user hierarchies shortly
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