.net barcode reader sdk free 2: Astrophysical: Playing with Dimensions in Microsoft Office

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2: Astrophysical: Playing with Dimensions
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axis is called a set, the set being projected along the axis A single tuple is automatically converted into a set However, if there is more than one tuple, they must be explicitly converted into a set The braces, the { and } delimiters, mean explicitly convert to set If you omit them, MDX gives the ambiguity error message
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Some MDX Shorthand
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The query here is a variation on the last query It demonstrates the use of some very popular shorthand in MDX
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Syntax
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-- 2 levels short hand select {[Product][Category][Category],[Product][Category]} on columns from [Adventure Works]
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The results are the same as those from the previous query, but the syntax is shorter The members function of the Category level has been omitted, as has the explicit reference to All Products on the Category hierarchy The behavior of MDX is to return members on a level by default, but to return the default (usually at the All level) member on a hierarchy
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Individual Members
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Often, you will want to reference an individual member There are a number of ways of doing this Here are four alternatives Try each one in turn and verify that they all produce the same output
Syntax
-- individual member by key and hierarchy select [Product][Category]&[1]
Practical MDX Queries for Microsoft SQL Ser ver Analysis Ser vices 2008
on columns from [Adventure Works] -- individual member by name and hierarchy select [Product][Category][Bikes] on columns from [Adventure Works] -- individual member by key and level select [Product][Category][Category]&[1] on columns from [Adventure Works] -- individual member by name and level select [Product][Category][Category][Bikes] on columns from [Adventure Works]
Result
Analysis
This is a difficult decision Which one are you going to use when you write your own queries Note the ampersand (&) in front of the key When you drag and drop members from the Metadata pane, the key notation is used Using a key is preferable if you think some members might have duplicate names For example, although it s unlikely, you might have two categories called Bikes More likely, you will have two or more customers with the name Smith Specifying the key value rather than the name value removes any ambiguity The drawback is that the code is not very readable, and heavy use of keys makes your MDX difficult to understand and debug especially when you look at it a few days later Many MDX developers prefer to use the name if they are certain duplicate names do not exist The first two examples use only the hierarchy The second two use the hierarchy and the level Possibly, using the hierarchy and level together is safer it is a fully qualified reference Again, this may be up to personal preference
2: Astrophysical: Playing with Dimensions
Multiple Members
You have just seen how to specify an individual member Earlier, we looked at how to return a set of members As you ll recall, there were a total of four product categories What happens if you want just two or three The following query demonstrates how to return two product categories
Syntax
-- two members by name select {[Product][Category][Bikes],[Product][Category][Clothing]} on columns from [Adventure Works]
Result
Analysis
Make sure that the two members that are also tuples are converted to a set with the braces delimiters Otherwise, you will receive an error message To include a third category, simply add it to the comma-separated list within the braces
User Hierarchies
The previous queries worked with attribute hierarchies In reality, your dimensions are likely to contain user hierarchies User hierarchies are created when dimensions are designed in BIDS A user hierarchy (often misleadingly called a multilevel hierarchy) is a hierarchy that has three or more levels (including the All level at the top), although it is technically possible to create a two-level user hierarchy from a single attribute hierarchy Attribute hierarchies, on the other hand, typically have two levels (including the All level at the top) It is possible to disable the All level, resulting in a single-level attribute hierarchy, but that is a BIDS design setting and is beyond the scope of an MDX query book User hierarchies come in two flavors: natural user hierarchies and unnatural user hierarchies (some people call these reporting user hierarchies) Again, this is a BIDS subject area, so we will not go into detail Whether your hierarchies are natural or unnatural has little relevance on the queries you write, but it may affect the performance of your queries Natural hierarchies generally return the data for the cells much quicker For your future
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