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Practical MDX Queries for Microsoft SQL Ser ver Analysis Ser vices 2008
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-- parallelperiod with calendar with member [Measures][Year Ago] as case when isempty(parallelperiod([Date][Calendar][Calendar Year],1, [Date][Calendar]currentmember)) then "NA" else ([Measures][Reseller Sales Amount], parallelperiod([Date][Calendar][Calendar Year],1,[Date][Calendar] currentmember)) end,format_string="Currency" member [Measures][Annual Increase] as iif([Measures][Year Ago] = "NA","NA", [Measures][Reseller Sales Amount] - [Measures][Year Ago]), format_string="Currency" select {[Measures][Reseller Sales Amount],[Measures][Year Ago], [Measures][Annual Increase]} on columns, nonempty([Date][Calendar][Calendar Quarter], [Measures][Reseller Sales Amount]) on rows from [Adventure Works]
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8: Clockwork: Calculations Using Dates and Times
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Perhaps, instead, I should say that the results are correct given the way ParallelPeriod works But, to you and me, the Year Ago and Annual Increase calculated measures for all the quarters of CY 2002 appear incorrect The next few queries will help you understand and arrive at a more satisfactory solution
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Cousin 1/2
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Now try this fairly easy MDX using the Cousin function
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-- cousin 1/2 select {cousin([Date][Calendar][Calendar Quarter][Q1 CY 2003], [Date][Calendar][Calendar Year][CY 2002]), [Date][Calendar][Calendar Quarter][Q1 CY 2003]} on columns from [Adventure Works]
Result
Analysis
This result is entirely reasonable We are briefly sidestepping to the Cousin function because it has a similar algorithm to ParallelPeriod but is perhaps easier to decipher This query is fine; the next one is not
Cousin 2/2
This is almost the same as the previous query another look at Cousin It s worthwhile studying the result, though
Syntax
-- cousin 2/2 select {cousin([Date][Calendar][Calendar Quarter][Q1 CY 2002],
Practical MDX Queries for Microsoft SQL Ser ver Analysis Ser vices 2008
[Date][Calendar][Calendar Year][CY 2001]), [Date][Calendar][Calendar Quarter][Q1 CY 2002]} on columns from [Adventure Works]
Result
Analysis
Maybe you thought Q1 CY 2001 was a year before Q1 CY 2002, not Q3 CY 2001 Cousin and ParallelPeriod don t quite work that way They are positional Q1 CY 2002 is the first quarter in CY 2002 The functions then look for the first quarter in CY 2001 This just happens to be Q3 CY 2001 there is no Q1 CY 2001 (or Q2 CY 2001) The functions are working correctly, but the results are counterintuitive The problem arises whenever individual members at a parent level have differing numbers of children at a lower level CY 2002 has four quarters whereas CY 2001 has only two quarters One solution is to add members Q1 CY 2001 and Q2 CY 2002 with null or zero sales Other solutions are discussed in the following queries
Workaround 1/2 Using Lag
Here we ve dispensed with ParallelPeriod (and Cousin) and employ the Lag property function instead to go back four quarters (or one year)
Syntax
-- workaround 1/2 lag with member [Measures][Year Ago] as case when isempty([Date][Calendar]currentmemberlag(4)) then "NA" else ([Measures][Reseller Sales Amount],[Date][Calendar]currentmemberlag(4)) end,format_string="Currency" member [Measures][Annual Increase] as iif([Measures][Year Ago] = "NA","NA", [Measures][Reseller Sales Amount] [Measures][Year Ago]),format_string="Currency" select
8: Clockwork: Calculations Using Dates and Times
{[Measures][Reseller Sales Amount], [Measures][Year Ago],[Measures][Annual Increase]} on columns, nonempty([Date][Calendar][Calendar Quarter], [Measures][Reseller Sales Amount]) on rows from [Adventure Works]
Result
Analysis
Because Lag operates differently from ParallelPeriod (and Cousin), the result is fine For example, Q1 CY 2002 displays NA in the calculated cells This is because there is no member that is four back But even this can break Take a look at the next query
Workaround 1/2 Using Lag Breaks
Let s try the previous query again, but this time Non Empty has been removed from the row specification
Syntax
-- workaround 1/2 lag fails for Q4 CY 2006 with member [Measures][Year Ago] as case when isempty([Date][Calendar]currentmemberlag(4)) then "NA" else
Practical MDX Queries for Microsoft SQL Ser ver Analysis Ser vices 2008
([Measures][Reseller Sales Amount],[Date][Calendar]currentmember lag(4)) end,format_string="Currency" member [Measures][Annual Increase] as iif([Measures][Year Ago] = "NA","NA", [Measures][Reseller Sales Amount] [Measures][Year Ago]),format_string="Currency" select {[Measures][Reseller Sales Amount], [Measures][Year Ago],[Measures][Annual Increase]} on columns, [Date][Calendar][Calendar Quarter] on rows from [Adventure Works]
Result
Analysis
Lag works for all the rows except the last one The two calculated cells for Q4 CY 2006 are incorrect In the last query, Non Empty suppressed Q4 CY 2006 This time, however, it s displayed Four back from Q4 CY 2006 is actually Q4 CY 2003 and not Q4 CY 2005 Hopefully, you ve learned some very important lessons, especially for working with time dimensions One, members of each level should have an equal number of children at the next level down Two, members should be contiguous no gaps A server time dimension can help avoid some of these problems If (as it is in the real world) your data is not perfect, attempt the next query
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