Chapter 25: Multidimensional Expressions

OLE DB for OLAP defines multidimensional expressions (MDX), which provide a rich syntax for specifying a dataset. MDX can be viewed as a set of macros defined on top of the SQL language. Although these macros are generally useful for querying a multidimensional data source, their precise semantics are defined by means of their SQL language mappings.

For more information about SQL language mappings, see Chapter 27: Mapping MDX to SQL Statements.

The following sections discuss concepts of MDX and provide examples of its use.