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Order (MDX)

Arranges members of a specified set, optionally preserving or breaking the hierarchy.

Numeric expression syntax
Order(Set_Expression, Numeric_Expression 
[ , { ASC | DESC | BASC | BDESC } ] )

String expression syntax
Order(Set_Expression, String_Expression 
[ , { ASC | DESC | BASC | BDESC } ] )

Set_Expression

A valid Multidimensional Expressions (MDX) expression that returns a set.

Numeric_Expression

A valid numeric expression that is typically a Multidimensional Expressions (MDX) expression of cell coordinates that return a number.

String_Expression

A valid string expression that is typically a valid Multidimensional Expressions (MDX) expression of cell coordinates that return a number expressed as a string.

The Order function can either be hierarchical (as specified by using the ASC or DESC flag) or nonhierarchical (as specified by using the BASC or BDESC flag; the B stands for "break hierarchy"). If ASC or DESC is specified, the Order function first arranges the members according to their position in the hierarchy, and then orders each level. If BASC or BDESC is specified, the Order function arranges members in the set without regard to the hierarchy. In no flag is specified, ASC is the default.

If the Order function is used with a set where two or more hierarchies are crossjoined, and the DESC flag is used, only the members of the last hierarchy in the set are ordered. This is a change from Analysis Services 2000 where all hierarchies in the set were ordered.

Examples

The following example returns, from the Adventure Works cube, the number of reseller orders for all Calendar Quarters from the Calendar hierarchy on the Date dimension.The Order function reorders the set for the ROWS axis. The Order function orders the set by [Reseller Order Count] in descending hierarchical order as determined by the [Calendar] hierarchy.

SELECT

Measures.[Reseller Order Count] ON COLUMNS,

Order(

[Date].[Calendar].[Calendar Quarter].MEMBERS

,Measures.[Reseller Order Count]

,DESC

) ON ROWS

FROM [Adventure Works]

Notice how in this example, when the DESC flag is changed to BDESC, the hierarchy is broken and the list of Calendar Quarters is returned with no regard for the hierarchy:

SELECT

Measures.[Reseller Order Count] ON COLUMNS,

Order(

[Date].[Calendar].[Calendar Quarter].MEMBERS

,Measures.[Reseller Order Count]

,BDESC

) ON ROWS

FROM [Adventure Works]

The following example returns the Reseller Sales Measure for the top five selling subcategories of products, irrespective of hierarchy, based on Reseller Gross Profit. The Subset function is used to return only the first 5 tuples in the set after the result is ordered using the Order function.

SELECT Subset

(Order

([Product].[Product Categories].[SubCategory].members

,[Measures].[Reseller Gross Profit]

,BDESC

)

,0

,5

) ON 0

FROM [Adventure Works]

The following example uses the Rank function to rank the members of the City hierarchy, based on the Reseller Sales Amount measure, and then displays them in ranked order. By using the Order function to first order the set of members of the City hierarchy, the sorting is done only once and then followed by a linear scan before being presented in sorted order.

WITH 
SET OrderedCities AS Order
   ([Geography].[City].[City].members
   , [Measures].[Reseller Sales Amount], BDESC
   )
MEMBER [Measures].[City Rank] AS Rank
   ([Geography].[City].CurrentMember, OrderedCities)
SELECT {[Measures].[City Rank],[Measures].[Reseller Sales Amount]}  ON 0 
,Order
   ([Geography].[City].[City].MEMBERS
   ,[City Rank], ASC)
    ON 1
FROM [Adventure Works]

The following example returns the number of products in the set that are unique, using the Order function to order the non-empty tuples before utilizing the Filter function. The CurrentOrdinal function is used to compare and eliminate ties.

WITH MEMBER [Measures].[PrdTies] AS Count
   (Filter
      (Order
        (NonEmpty
          ([Product].[Product].[Product].Members
          , {[Measures].[Reseller Order Quantity]}
          )
       , [Measures].[Reseller Order Quantity]
       , BDESC
       ) AS OrdPrds
    , (OrdPrds.CurrentOrdinal < OrdPrds.Count 
       AND [Measures].[Reseller Order Quantity] = 
          ( [Measures].[Reseller Order Quantity]
            , OrdPrds.Item
               (OrdPrds.CurrentOrdinal
               )
            )
         )
         OR (OrdPrds.CurrentOrdinal > 1 
            AND [Measures].[Reseller Order Quantity] = 
               ([Measures].[Reseller Order Quantity]
               , OrdPrds.Item
                  (OrdPrds.CurrentOrdinal-2)
                )
             )
          )
       )
SELECT {[Measures].[PrdTies]} ON 0
FROM [Adventure Works]

To understand how the DESC flag works with sets of tuples, first consider the results of the following query:

SELECT
{[Measures].[Tax Amount]} ON 0,
ORDER(
[Sales Territory].[Sales Territory].[Group].MEMBERS
,[Measures].[Tax Amount], DESC)
ON 1
FROM [Adventure Works]

On the Rows axis you can see that the Sales Territory Groups have been ordered in descending order by Tax Amount, as follows: North America, Europe, Pacific, NA. Now see what happens if we crossjoin the set of Sales Territory Groups with the set of Product Subcategories and apply the Order function in the same way, as follows:

SELECT
{[Measures].[Tax Amount]} ON 0,
ORDER(
[Sales Territory].[Sales Territory].[Group].MEMBERS
*
{[Product].[Product Categories].[subCategory].Members}
,[Measures].[Tax Amount], DESC)
ON 1
FROM [Adventure Works]

While the set of Product Subcategories has been ordered in descending, hierarchical order, the Sales Territory Groups are now not sorted and appear in the order they appear on the hierarchy: Europe, NA, North America and Pacific. This is because only the last hierarchy in the set of tuples, Product Subcategories, is sorted. To reproduce the behavior of Analysis Services 2000, use a series of nested Generate functions to sort each set before it is crossjoined, for example:

SELECT
{[Measures].[Tax Amount]} ON 0,
GENERATE(
ORDER(
[Sales Territory].[Sales Territory].[Group].MEMBERS
,[Measures].[Tax Amount], DESC)
,
ORDER(
[Sales Territory].[Sales Territory].CURRENTMEMBER
*
{[Product].[Product Categories].[subCategory].Members}
,[Measures].[Tax Amount], DESC))
ON 1
FROM [Adventure Works]
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