Fast track to MDX by Mark Whitehorn

By Mark Whitehorn

Indicates clients and builders easy methods to use MDX to successfully to supply proper enterprise details.

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They both even use SELECT, FROM and WHERE, which means that the queries you can write with them sound similar. So MDX is pretty much like SQL? No, despite the apparent similarities, the languages differ in several significant ways. For a start, SQL isn’t simply a query language (despite its name); it also has a whole raft of commands devoted to defining the data structures themselves. In other words you can use all sorts of commands such as CREATE, DROP, INSERT, DELETE etc. to construct and modify your table structures and data.

Instead, the server generates the unique names for them, and it has all kinds of rules about how it can do this. name. [Tacoma] or even sometimes something completely different. As far as the tools are concerned, they never try to make sense out of the names. Instead they let the user point and click to the objects they want in the interface and the tool uses the names it has been given for those objects to generate the MDX that is then sent back to the server as a query or an expression. Handwritten MDX, on the other hand, can use whatever the person writing it feels like at the time.

To construct and modify your table structures and data. 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.

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