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These two queries are only relevant if you have the Enterprise edition of SSAS (you may want to move on to the next query if you don t have the Enterprise edition) The Enterprise edition supports an aspect of cube design called a perspective The Standard edition does not include support for perspectives A perspective reveals only a portion of the cube to your MDX queries Perspectives are created at design time back in BIDS and their design is beyond the scope of this book If you do have perspectives, they can be seen in the Perspectives tab of your cube design A perspective is analogous to a single-table view on a relational database Perspectives are related to the virtual cubes feature of Analysis Services 2000 They differ from subselects and subcubes Subselects and subcubes (discussed in the next few queries) are created in your MDX; perspectives are predefined
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-- select from a perspective select [Measures][Internet Sales Amount] on columns from [Direct Sales] select [Measures][Reseller Sales Amount] on columns from [Direct Sales]
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If you attempted both the queries, you will see that the preceding result only occurs with the first query The second query returns absolutely nothing The reason is that Internet Sales Amount is a measure included in the perspective (Direct Sales), whereas Reseller Sales Amount is not, even though the latter is part of the larger Adventure Works cube Notice we are not using the cube name in the From clause
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Base Query for Subselects
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A subselect is a Select within a Select Subselects are analogous to subqueries in SQL Before we embark on a short tour of subselects, here s a base query
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Syntax
-- base query for subselect select [Sales Reason][Sales Reasons][Reason Type] on columns from [Adventure Works] where [Measures][Internet Sales Amount]
Result
Analysis
Nothing complicated But note the value ($18,678,94802) in the cell for sale reason Other
Subselect 1/2
A subselect requires that you replace the cube name in the From clause with another complete and self-contained Select The inner Select must be self-standing that is, it will function as a query if run by itself
Syntax
-- subselect 1/2 select
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[Sales Reason][Sales Reasons][Reason Type] on columns from (select [Sales Reason][Sales Reasons][Reason Type][Other] on columns from [Adventure Works] ) where [Measures][Internet Sales Amount]
Result
Analysis
The subselect restricts the outer query to only seeing the sales reason type Other The other reason types are not available to the outer query Note that the Where clause is outside the subselect and slices on Internet Sales Amount
Subselect 2/2
This version of the previous subselect is subtly different It s going to return an invalid result the Sales Reason dimension is not related to the Reseller Sales measure group in the cube design If you are familiar with BIDS, take a look at the IgnoreUnrelatedDimensions property for measure groups you can use that to suppress the cell value
Syntax
-- subselect 2/2 select [Sales Reason][Sales Reasons][Reason Type] on columns from (select [Sales Reason][Sales Reasons][Reason Type][Other] on columns from [Adventure Works] where [Measures][Internet Sales Amount])
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Result
Analysis
The single cell displays the Reseller Sales Amount and not the Internet Sales Amount In this version, the Where slicer is inside the subselect and not part of the outer query (contrast this with the last query) The outer query does not specify any measure, so the default measure (Reseller Sales Amount) is applied This may be counterintuitive, but it s how subselects work and it s worth knowing
Visual Totals
Subselects, by default, use an SSAS feature called visual totals If you are an SSAS administrator and get involved in cube and dimension security, you might have already met visual totals It really is a clever concept
Syntax
-- visual totals select {[Date][Calendar],[Date][Calendar][Calendar Year]members} on columns from (select [Date][Calendar][Calendar Year][CY 2002]: [Date][Calendar][Calendar Year][CY 2004] on columns from [Adventure Works])
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