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Learn to Write MDX Queries in Analysis Services (SSAS)

MDX (MultiDimensional eXpressions)

–> To work with Normal two – dimensional applications, two dimensional programming languages are enough ( C, C ++, .NET …etc)

–> To work with Two – Dimensional data bases, two- dimensional Query language SQL is wrought (Oracle SQL, T – SQL, Teradata SQL – etc.)

–> To work with multidimensional allocations and multi dimensional data bases the above specified or not enough so we go for a separate expression and Query language ‘ MDX ‘.

Important terminology in MDX :

a) Member: Dimension attribute is called member

–> Syntax:-

[Dimension table name] . [Attribute Name]

                Ex:         [ Product ] . [ Product Name ]

[ Location ] . [ Location name ]

Measure: Fact attribute is called Measure.

Syntax: [ Measures ] . [ Measures Name ]

Ex:         [ Measures ] . [ Actual Cost ]

[ Measures ] . [ Estimated Cost ]

TUPLE: Collection of Measures or Members is called Tuple.

a. Starts with (

b. Ends with   )

Ex:      ( [ Measures ] . [ Actual Cost ] , [ Measures ] . [ Estimated Cost ] )

SET:     Group of Tuples are called as SET.

a. Stores with {

b. Ends with    }

Ex:          {

( [ Measures ] . [ Actual Cost ] , [ Measures ] . [ Estimated Cost ] ,

( [ Measures ] . [ Actual Cost ] , [ Measures ] . [ Estimated Cost ] )

}

MDX Query

1. Generally MDX queries we write in analysis services cube data base.

2. For retrieving data from cube data base we use Select  statements.

Syntax:

Select { Measures / Members } ON columns , { Measures / Members } ON rows

From < cube name > where < condition > ;

Some Functions In MDX And There Meanings:

There  are two types functions

1) Some Functions takes Parameters

Ex:  TOP COUNT , BOTTOM COUNT , ISEMPTY etc

(Top count) ,  (Bottom Count)

2) Functions without Parameters

Ex:  .MEMBERS , .ALLMEMBERS , .CHILDREN , .PREVMEMBER , .CURRENTMEMBER Etc..

.MEMBERS: It displays the child members without including total.

.ALLMEMBERS: Display All members and their total.

.PREVMEMBER: Display previous members to the current member.

.CURRENTMEMBER: Display the current cell member value.

3) Functions with Parameters

ISEMPTY: It verifies whether the member is empty or not.

Syntax: Is Empty (set)

TOPCOUNT: Display Top values.

Syntax: Top Count (set, value)

BOTTOMCOUNT: Display bottom count of values

Syntax: Bottom Count (set, value)

FILTER: It filters the given set based on the condition

Syntax: Filter (set, condition)

ORDER: It displays the set by keeping a descending & ascending on the given column.

DISTINCT ( ): It displays the set values

DISTINCT ( {set} )

4) Working with Hierarchies

We refer hierarchies member values in 2 ways.

a. [Dimension] . [Hierarchy] . [Members]

b. [Dimension] . [Hierarchy] . [Level] . [Members]

NOTE: If we don’t specify the level, it displays all member values.

CROSS JOIN: CROSS JOIN ( {set} , {set} ) (OR) {set} * {set}

Important MDX queries:

Navigation:

SSMS –> Analysis Services –> TEXTILES_CUBE –> RC –> New Query –> MDX

MDX Queries

1) DISPLAY FIRST MEASURE SUM

Syntax: Select from [TEXTFILES_CUBE]  cube name

2) DISPLAY NO. OF ROWS IN THE CUBE

Syntax: Select [Measures] . [TEXT FACT COUNT] on columns from [TEXTFILES_CUBE]

3) DISPLAY ALL BRANCHES ACTUAL COST

Syntax: Select [Measures] . [ActualCost] on columns , [Product] . [Brand] on rows from [DSV_textfiles_cube]

Actual cost    9800.

4) DISPALY BRANCHES AND THEIR ACTUAL COST

Syntax: Select [Measures] . [ActualCost] on columns , [Product] . [Brand] . children on rows from [TextFile_cube]

5) DISPALY ALL BRANCHE ACTUAL COST AND SUM OF ALL ACTUAL COST

Syntax: Select [Measures] . [ActualCost] on columns , [Product] . [Brand] . ALLMEMBERS on rows from [TEXTFILES_CUBE]

6) DISPLAYING EVERY RAW MATERIAL AND LOCATION, THEIR ACTUAL COST

Syntax: Select ([Measures] . [ActualCost] , [Measures] . [Estimated cost]) on columns , ([RawMaterial] . [Rawmaterial ID] . children [Location] . [Loc Name] . children) on Rows from [TEXTFILES_CUBE]

7) DISPLAY THE FIRST RAW MATERIAL ACTUAL COST:

Syntax: Select [Measures] . [ActualCost] on columns . [RawMaterial] . [Rawmaterial ID]

first child on rows from [TEXTFILES_CUBE]

8) DISPLAYING TOP TWO VALUES OF THE LOCATION

Syntax: Select [Measures] . [ActualCost] on columns , TopCount ([Location] . [ LocName] . children,2 ) on rows from [TEXTFILES_CUBE]

9) DISPLAYING BOTTOM TWO LOCATION VALUES

Syntax: Select [Measures] . [ActualCost] on columns , Bottom Count ([Location] . [LocName] . children, 2 ) on rows from [TEXTFILES_CUBE]

10) DISPLAY THE LOCATION TOOLS ACTUAL COST is > 1000

Syntax: Select [Measures] . [ActualCost] on columns , filter ([Location] . [ LocName] . children,    [Measures] . [ActualCost] > 1000) on rows from [TEXTFILES_CUBE]

11) DISPLAY THE DATA IN ACTUAL COST SORTED ORDER IN ASC

Syntax: Select [Measures] . [ActualCost] on columns , order ([Location] . [ LocName] . children,    [Measures] . [ActualCost] , ASC ] on rows

 12) DISPLAY THE CRO PRODUCT OF LOCATION PRODUCT AS WELL AS THEIR ACTUAL, ESTIMATED COST.

Syntax: Select {[Measures] . [ActualCost] , [Measures] . [Estimated cost]} on columns, cross join ([Location] . [ LocName] . children , [Product] . [Product Name] . children) on rows from [TEXTFILES_CUBE]

                                OR

Select {[Measures] . [ActualCost] , [Measures] . [Estimated cost]} on columns, cross join ([Location] . [ LocName] . children) * ([EProduct] . [Product Name] . children) on rows from [TEXTFILES_CUBE]

13) DISPLAY DISTINCT FROM DISTINCTWISE VALUES AND LACATIONWISE

Syntax: Select {[Measures] . [ActualCost] , [Measures] . [Estimated cost]} on columns, DISTINCT ([Location] . [ LocName] . children , [Product] . [Product Name] . children) on rows from [TEXTFILES_CUBE]

14) DISPLAY 2009 YEAR ACTUAL COST SUM

Syntax: Select [Measures] . [ActualCost] on columns from [TextFile_Cube] where [Time] .[Year] . & [2009]

OR

Select [Measures] . [ActualCost] on columns , [Location] . [ LocName] . children on rows from [DSV_TextFiles_cube] where {[Time] . [Year] . & [2009]}

Conditional Expressions

IF: IF ( <condition> , success stmt , failed stmt )

Eg: IF ([Measure] .[ActualCost] – [Measures] . [Estimated cost] > 0,1,0)

CASE: Evaluates against multiple conditions

CASE

When < condition1 > then < statement1 >

When < condition2 > then < statement2 >

When < condition3 > then < statement3 >

When < condition4 > then < statement4 >

ELSE < statement 5 >

END

Ex: Case when [Measure] .[ActualCost] – [Measures] . [Estimated cost] > 0 Then -1 / where [Measure] .[ActualCost] – [Measures] . [Estimated cost] < 0 Then 1 / When [Measure] .[ActualCost] – [Measures] . [Estimated cost] = 0 Then 0

END

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