About the Series ...
This is the seventeenth article of the series, MDX
Essentials. The series is designed to provide hands-on application of the
fundamentals of the Multidimensional Expressions (MDX) language, with
each tutorial progressively adding features designed to meet specific real-world
needs.
For more information about the series in general, as well as
the software and systems requirements needed for getting the most out of the
lessons included, please see the first article, MDX at
First Glance: Introduction to MDX Essentials.
Note: Service Pack 3 updates are assumed for MSSQL
Server 2000, MSSQL Server 2000 Analysis Services, and the related Books
Online and Samples.
What We Accomplished in our Last Article
In the
last article of the series, Basic Set Functions: The Filter() Function,
we explored the useful
Filter() function. We learned that the purpose of the function is to
allow us to filter out parts of a set that we do not need, and to return a
subset of a larger specified set as a result. We discussed Filter() in
general, along with the capabilities it affords us within MDX, emphasizing its
value in helping us to attain efficiency and precision in our MDX queries.
In addition to discussing the purpose and operation of the Filter()
function, we examined the syntax involved in its use. We then illustrated its
application in practice exercises. Finally, we provided, as a complement to
our hands-on exposure to the Filter() function, a brief discussion of
the MDX results we obtained.
Introduction
Microsoft
Analysis Services ("MSAS"), as most of us know, leads the enterprise
business intelligence arena with its rich set of mathematical and analytical
tools. Most of these tools rely upon functions based in the MDX query
language. MDX is integrated not only within MSAS, but also throughout the
entire Microsoft Business Intelligence Platform in applications that include Data
Mining and Reporting
Services. This integration provides a distinct advantage for the
platform over the offerings of other vendors, and, particularly in the case of
numerical functions, allows for easy, consistent application of built-in logic.
In
this lesson, we will extend our attention from the purely set-related functions
upon which we have concentrated in the last several articles; we will focus on
a numerical function, Count(), specifically as it is applied to sets.
We will discuss the straightforward purpose of the function, to return the
number of cells in a specified set, and then expose approaches within the
syntax for handling the inclusion or exclusion of empty cells within the
returned result.
Along
with an introduction to the Count() function, this lesson will include:
-
an examination of the syntaxes surrounding the function;
-
illustrative examples of the uses of the function in practice
exercises;
-
a brief discussion of the MDX results we obtain in the practice
examples.
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