MDX Operators: The IS Operator - Page 4

July 5, 2006

Procedure: Use the IS Operator to Perform Comparisons within the FILTER() Function

The report authors / developers have an additional request which we can help them to meet with the IS operator. This time, they wish to use the Filter() function within a query which will allow them to focus upon Internet Sales at a specific geographical level. While our colleagues have asked that we craft the query to return the Internet Sales measure for customers within a single U. S. state, Georgia, for Fiscal Year 2004, we confirm their understanding that, given the core query, the capability to perform ad hoc queries, where the information consumer is prompted at runtime for a state or states (or members at other geographic levels, for that matter) becomes a simple matter of parameterizing the unique name for the state, etc., within the Filter() function we will place within the rows-axis specification of the query. Because we have demonstrated to the developers, that parameterization of this sort becomes easily attainable within Reporting Services, assuming that sufficiently sophisticated queries are put into place to support it (within either the Reporting Services or Analysis Services layers), the core query is deemed valuable to the team.

NOTE: For detailed information about the Filter() function, including practical examples that demonstrate its use, see Basic Set Functions: The Filter() Function, within my MDX Essentials series.

Having obtained consensus on the proposed target dataset, we are ready to begin constructing the query.

4.  Select File --> New from the main menu.

5.  Select Query with Current Connection from the cascading menu that appears next, as depicted in Illustration 11.


Illustration 11: Create a New Query with the Current Connection ...

A new tab, with a connection to the Adventure Works cube (we can see it listed in the selector of the Metadata pane, once again) appears in the Query pane.

6.  Type (or cut and paste) the following query into the Query pane:

-- MDX045-002-1 IS Operator within a Filter() Function
 
SELECT 
 
{[Measures].[Internet Sales Amount]} ON AXIS(0),
 
{FILTER (
 
   [Customer].[Customer Geography].MEMBERS,
    
      [Customer].[Customer Geography].CURRENTMEMBER.PARENT 
    
         IS [Customer].[Customer Geography].[State-Province].[Georgia]
   
      ) 
 
   } ON AXIS(1)
   
FROM 
 
   [Adventure Works]
 
WHERE
 
   ([Date].[Fiscal].[Fiscal Year].[FY 2004])

The Query pane appears, with our input, as shown in Illustration 12.


Illustration 12: Our Initial Query in the Query Pane ...

7.  Execute the query by clicking the Execute button in the toolbar, as before.

The Results pane is, once again, populated by Analysis Services. This time, the dataset depicted in Illustration 12 appears.


Illustration 13: Results Dataset –The Filtered Dataset is Returned ...

In the returned dataset, we see that the query appears to deliver the intended results: only those members of Customer Geography whose parent is the State-Province of Georgia (the cities of Georgia) are displayed.

8.  Select File -> Save MDXQuery2.mdx As ..., name the file MDX045-002-1.mdx, and place it in the same location used to store the earlier queries.

The effect, as we see, has been to filter the results dataset to return only those members that "pass" the conditional test enacted by the IS operator within the Filter() function. That is, only those members who return a "true" are included within the final results.

The client representatives inform us that their immediate goals have been met, and that the examples we have shared have illustrated the principles of operation behind IS operator. We discuss related matters, such as parameterization within Reporting Services, and make an appointment to return to the client site at a future date to demonstrate the concepts.

9.  Select File -> Exit to leave the SQL Server Management Studio, when ready.

Summary ...

In this article, we shifted our examination from the MDX functions, as we have upon occasion in the past, to concentrate upon an operator. We introduced the IS operator, noting that, like other logical operators, it evaluates values and returns a Boolean value. We explained that the IS operator's utility lies in its capability to perform comparisons between objects within Analysis Services.

After discussing the straightforward purpose of the IS operator, to ascertain the equivalence of two object expressions, we examined the manner in which IS manages to do this, and ways we can leverage the operator to perform efficient comparisons to meet various business needs in our own environments. Next, we examined the syntax with which we employ IS. Finally, we undertook illustrative examples whereby we put the IS operator to work, both within the definition of a calculated member and, in conjunction with the MDX Filter() function, within an axis specification of a SELECT statement, to gain some hands-on practice in its use. Throughout our practice session, we briefly discussed the results datasets we obtained from each of the queries we constructed.

» See All Articles by Columnist William E. Pearson, III

Discuss this article in the MSSQL Server 2000 Analysis Services and MDX Topics Forum.

MDX Essentials Series
The LEVEL_NUMBER Member Property
The LEVEL_UNIQUE_NAME Intrinsic Member Property
Intrinsic Member Properties: The HIERARCHY_UNIQUE_NAME Property
Intrinsic Member Properties: The DIMENSION_UNIQUE_NAME Property
Further Combination of BottomCount() with Other MDX Functions
Combine BottomCount() with Other MDX Functions to Add Sophistication
Basic Set Functions: The BottomCount() Function, Part I
Intrinsic Member Properties: The MEMBER_VALUE Property
Intrinsic Member Properties: The MEMBER_UNIQUE_NAME Property
Intrinsic Member Properties: The MEMBER_NAME Property
Intrinsic Member Properties: The MEMBER_KEY Property
Intrinsic Member Properties: The MEMBER_CAPTION Property
Set Functions: The StripCalculatedMembers() Function
Set Functions: The AddCalculatedMembers() Function
MDX Numeric Functions: The Min() Function
MDX Numeric Functions: The Max() Function
Set Functions: The .AllMembers Function
MDX Essentials: Set Functions: The MeasureGroupMeasures() Function
String Functions: The .Properties Function, Part II
String Functions: The .Properties Function
Logical Functions: IsGeneration(): Conditional Logic within Filter Expressions
MDX Scripting Statements: Introducing the Simple CASE Statement
Logical Functions: IsGeneration(): Conditional Logic within Calculations
Logical Functions: IsAncestor(): Conditional Logic within Filter Expressions
MDX Clauses and Keywords: Use HAVING to Filter an Axis
Logical Functions: IsAncestor(): Conditional Logic within Calculations
Logical Functions: IsSibling(): Conditional Logic within Filter Expressions
Logical Functions: IsSibling(): Conditional Logic within Calculations
MDX Operators: The IsLeaf() Operator: Conditional Logic within Filter Expressions
MDX Operators: The IsLeaf() Operator: Conditional Logic within Calculations
MDX Numeric Functions: The .Ordinal Function
Other MDX Entities: Perspectives
MDX Operators: The IS Operator
MDX Set Functions: The Distinct() Function
MDX Set Functions: The ToggleDrillState() Function
Set Functions: The DrillUpLevel() Function
Set Functions: The DrillDownLevelTop() and DrillDownLevelBottom() Functions
MDX Set Functions: DrillDownLevel()
MDX Set Functions: The DRILLUPMEMBER() Function
MDX Essentials: Set Functions: The DRILLDOWNMEMBERTOP() and DRILLDOWNMEMBERBOTTOM() Functions
MDX Essentials : Set Functions: The DRILLDOWNMEMBER() Function
MDX Essentials: Drilling Through with MDX: The DRILLTHROUGH Statement
MDX Essentials: String Functions: The .UniqueName Function
MDX Essentials: String Functions: The .Name Function
MDX Essentials: String / Numeric Functions: The CoalesceEmpty() Function
MDX Essentials: Basic Set Functions: The TopCount() Function, Part II
MDX Essentials: Basic Set Functions: The TopCount() Function, Part I
MDX Essentials: Enhancing CROSSJOIN() with Calculated Members
MDX Essentials: Set and String Functions: The GENERATE() Function
MDX Essentials: The CROSSJOIN() Function: Breaking Bottlenecks
MDX Essentials: String / Numeric Functions: More on the IIF() Function
MDX Essentials: String / Numeric Functions: Introducing the IIF() Function
MDX Essentials: Logical Functions: The IsEmpty() Function
MDX Essentials: Basic Set Functions: The EXTRACT() Function
MDX Essentials: Numeric Functions: Introduction to the AVG() Function
MDX Essentials: Basic Member Functions: The .Item() Function
MDX Essentials: Basic Set Functions: Subset Functions: The Subset() Function
MDX Essentials: Basic Set Functions: Subset Functions: The Tail() Function
MDX Essentials: Basic Set Functions: Subset Functions: The Head() Function
MDX Essentials: Basic Set Functions: The CrossJoin() Function
MDX Essentials: Basic Numeric Functions: The Count() Function
MDX Essentials: Basic Set Functions: The Filter() Function
MDX Essentials: Basic Set Functions: The EXCEPT() Function
MDX Essentials: Basic Set Functions: The Intersect() Function
MDX Essentials: Basic Set Functions: The Union() Function
MDX Essentials: Basic Set Functions: The Order() Function
MDX Essentials - MDX Time Series Functions, Part III: The LastPeriods() and ParallelPeriod() Functions
MDX Time Series Functions, Part II: The OpeningPeriod () and ClosingPeriod() Functions
MDX Essentials - MDX Time Series Functions, Part I: PeriodsToDate() and Kindred Functions
MDX Essentials: MDX Member Functions: "Relative" Member Functions
MDX Member Functions: The Cousin () Function
MDX Essentials: Member Functions: More "Family" Functions
MDX Member Functions: The "Family" Functions
MDX Essentials: MDX Members: Introducing Members and Member
MDX Essentials : MDX Operators: The Basics
MDX Essentials: Structure of the MDX Data Model
MDX at First Glance: Introduction to SQL Server MDX Essentials








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