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Families and Friends: Navigating Dimensions
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Practical MDX Queries for Microsoft SQL Ser ver Analysis Ser vices 2008
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n this chapter, we explore moving up and down and across dimensions and hierarchies The general term for doing this is navigation MDX allows you to navigate both horizontally and vertically MDX (unlike SQL) is positionally aware it knows where you are in the cube and can help you in your navigation Key concepts Finding dimension members that have some relationship to a particular member, using ranges Keywords children, Descendants, Exists, parent, Ancestor, Ascendants, Hierarchize, siblings, rstchild, rstsibling, lastchild, lastsibling, Cousin, lead, lag, Head, Tail, prevmember, nextmember
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Dimensions Have Members
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Dimensions have members For example, the country France is a member of the Customer dimension The property function to enumerate members is members
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-- dimension members select [Customer]members on columns from [Adventure Works]
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Analysis
If, as is usual, a dimension contains more than one hierarchy (attribute and user hierarchies), then you can t use members to list all the members in the dimension Anyway, listing all the members of a large dimension might easily return millions of members It makes more sense to divide up the dimension Using hierarchies enables you to do this
C h a p t e r 3 : Fa m i l i e s a n d Fr i e n d s : N a v i g a t i n g D i m e n s i o n s
Hierarchies Have Members
Because the hierarchy (Customer Geography) is explicitly contained in the query, it doesn t matter that the dimension (Customer) has more than one hierarchy
Syntax
-- hierarchy members select [Measures][Internet Sales Amount] on columns, [Customer][Customer Geography]members on rows from [Adventure Works]
Result
Analysis
This is a pretty big hierarchy It may take a second or two for the results to be returned Only a very small section is shown in the screenshot Perhaps the lesson to learn here is that dimensions have members, dimensions have hierarchies, and hierarchies have members The members of a hierarchy are arranged in levels; therefore, it follows that levels also have members
Levels Have Members
Running this query proves that levels have members We are using the Country level of the Customer Geography hierarchy of the Customer dimension
Practical MDX Queries for Microsoft SQL Ser ver Analysis Ser vices 2008
Syntax
-- level members select [Measures][Internet Sales Amount] on columns, [Customer][Customer Geography][Country]members on rows from [Adventure Works]
Result
Analysis
Hopefully we have established that levels have members Hierarchies have members, with a level containing a subset of the hierarchy members Dimensions have members, with a hierarchy containing a subset of the dimension members At the risk of sounding a little repetitive, dimensions and hierarchies and levels all have members In addition, dimensions have hierarchies, and hierarchies have levels This discussion is preliminary to the queries in this chapter that are concerned with navigating to members using levels and hierarchies I wonder if members have members as well
Do Member Have Members
Let s go down another tier The query has been extended from the last one to include a member (France)
Syntax
-- member members select [Measures][Internet Sales Amount] on columns, [Customer][Customer Geography][Country][France]members on rows from [Adventure Works]
C h a p t e r 3 : Fa m i l i e s a n d Fr i e n d s : N a v i g a t i n g D i m e n s i o n s
Result
Analysis
The gist of the error message is that you can t use the members function on a member Members don t have members Members have something different, and they are called children
Members Have Children
The members function has been replaced with children
Syntax
-- children select [Measures][Internet Sales Amount] on columns, [Customer][Customer Geography][Country][France]children on rows from [Adventure Works]
Result
Practical MDX Queries for Microsoft SQL Ser ver Analysis Ser vices 2008
Analysis
Members have children Members don t have members To say that members have children is true up to a point The children of France, for example, include Yveline France is at the Country level, and Yveline is at the State-Province level You can check this by expanding the Customer Geography hierarchy pyramid in the Metadata pane The children of France do not include Paris This is because Paris is at the City level of the hierarchy Paris is a grandchild, rather than a child, of France Then we could go down to the next level (Postal Code) and even to the next level (Customer) The Customer level is the lowest level in the hierarchy it s called the leaf level You can t drill any further down Therefore, members of the Customer level don t have children but they do have a parent! So how do we get down to Paris from France How do we jump a level Jumping up and down and across hierarchies is called navigation
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