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Practical MDX Queries for Microsoft SQL Ser ver Analysis Ser vices 2008
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Here are two queries and two cellsets demonstrating the use of the Head function
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-- head first one select head([Date][Fiscal][Fiscal Quarter],1) on columns from [Adventure Works] -- head first two select head([Date][Fiscal][Fiscal Quarter],2) on columns from [Adventure Works]
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Head with a parameter of 1 is the same as Item(0) (Technically, there is a difference in that Head returns a set of one item and Item simply returns an item) Item is zero based and returns one tuple/member from a set Head is one based and can return multiple members The second result shows the first two quarters in the Fiscal Quarter hierarchy
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Show me the second fiscal quarter followed by the next two quarters This query introduces Subset
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C h a p te r 9 : Ve n n D i a g ra m s : V i s u a l i z i n g a n d M a n i p u l a t i n g S e t s
Syntax
-- second quarter then the next two select subset([Date][Fiscal][Fiscal Quarter],1,3) on columns from [Adventure Works]
Result
Analysis
Subset takes two numeric parameters The first parameter is the start position of a member The second parameter is the number of members to return The parameters are not intuitive Subset (like Item and unlike Head) starts at zero Thus, our query starts at the second fiscal quarter The second parameter is how many members to return, including the first member
Tail
You wish to display the last two fiscal quarters This is the Tail function
Syntax
-- tail select tail([Date][Fiscal][Fiscal Quarter],2) on columns from [Adventure Works]
Result
Practical MDX Queries for Microsoft SQL Ser ver Analysis Ser vices 2008
Analysis
If you omit the second numeric parameter for Tail, it defaults to 1 The same applies to Head
Subset with Count
Count gives you the number of members in a set Here it s combined with Subset
Syntax
-- fifth last then two more select subset([Date][Fiscal][Fiscal Quarter], [Date][Fiscal][Fiscal Quarter]count-5,3) on columns from [Adventure Works]
Result
Analysis
Count-5 returns the fifth last member Then we show a total of three members including that one
Nonvisual Totals
A normal MDX Select shows any totals as nonvisual totals This query has the total for All Periods and the values that help make up that total for three individual calendar years
Syntax
-- non visual totals select {[Date][Calendar],[Date][Calendar][Calendar Year][CY 2002]: [Date][Calendar][Calendar Year][CY 2004]} on columns from [Adventure Works]
C h a p te r 9 : Ve n n D i a g ra m s : V i s u a l i z i n g a n d M a n i p u l a t i n g S e t s
Result
Analysis
The query deliberately omitted two calendar years However, if you add the values for the three years shown and subtract that from the All Periods total, you can work out the combined value for the two missing years
Visual Totals
This may be the preferable behavior The figure for All Periods is different from the last query In SSAS and MDX, this is known as a visual total
Syntax
-- visual totals select visualtotals({[Date][Calendar],[Date][Calendar][Calendar Year] [CY 2002]:[Date][Calendar][Calendar Year][CY 2004]}) on columns from [Adventure Works]
Result
Analysis
Notice the all-important change to the value for All Periods This is achieved by the VisualTotals function Now it s impossible to figure out the combined sales for the two missing calendar years If this is the behavior you want, you must specify it Subselects and subcubes (introduced in the next chapter) are exactly the opposite By default, subselects and subcubes use visual totals Should you want nonvisual totals in subselects and subcubes, you have to explicitly ask for them
Practical MDX Queries for Microsoft SQL Ser ver Analysis Ser vices 2008
Note that the reference to All Periods must come first The following query does not produce the same result:
Select visualtotals({[Date][Calendar][Calendar Year][CY 2002]: [Date][Calendar][Calendar Year][CY 2004],[Date][Calendar]}) on columns from [Adventure Works]
Named Sets 1/2
Named sets simplify your columns or rows specification in the Select part of the query Here the named set is Europe
Syntax
-- with set - gives a named set with set [Europe] as {[Customer][Customer Geography][Country][France], [Customer][Customer Geography][Country][Germany], [Customer][Customer Geography][Country][United Kingdom]} select [Europe] on columns from [Adventure Works] where [Measures][Internet Sales Amount]
Result
Analysis
With Set is query scoped You can t reuse [Europe] in another query, unless you repeat the With Set
Named Sets 2/2
Here are three queries for you to try Be sure to run them separately The result shown is for the Select query only
C h a p te r 9 : Ve n n D i a g ra m s : V i s u a l i z i n g a n d M a n i p u l a t i n g S e t s
Syntax
-- create set - gives a set create set [Adventure Works][Europe] as {[Customer][Customer Geography][Country][France], [Customer][Customer Geography][Country][Germany], [Customer][Customer Geography][Country][United Kingdom]} -- select from named set select [Europe] on columns from [Adventure Works] where [Measures][Internet Sales Amount] -- drop set drop set [Adventure Works][Europe]
Result
Analysis
If you wanted, before you dropped the named set, you could run the Select again or write another Select query (in the same query editor window) that specified [Europe] on its columns or rows Create Set is session scoped
MeasureGroupMeasures
You can create a set of measures members by listing each measure individually However, if all the measures belong to the same measure group, the following is a convenient shorthand
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