By Mark Whitehorn
Indicates clients and builders tips on how to use MDX to successfully to supply correct company details.
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Children} ON ROWS FROM [Sales_MDX1] and, in fact, this is the form of the query that we have provided in the text file. ❜ Hopefully, you are now really interested in functions like Children because they are clearly mind-bogglingly useful in MDX. There’s more about them in Chapter 6.
Each of these four tuples has exactly one member from the Time, Store and Product dimensions, so these tuples have the same dimensionality. Therefore it is clearly a set. ” It describes the intersection of two members and each is taken from a different dimension. ” But appearances can be deceptive! And this is crunch time, this is where people have trouble with the definition of a tuple. So, let’s be quite clear about what we are trying to say. [Anchovies]) is a tuple. The over-riding reason that we know it is a tuple is because it doesn’t use more than one member from the same dimension.
While it is true that you can create local and session OLAP cubes with MDX commands, most general manipulation of the underlying structures is done via the DSO (Decision Support Objects) interface. On the other hand, MDX can be used for things that SQL can’t directly – like defining advanced security settings, custom member roll-ups, custom 29 How MDX is used level roll-ups, actions and so on. ) Now think about the internal structure of OLAP cubes, as described in Chapter 1 – all those levels, dimensions, hierarchies etc.