Level Expressions (MDX)

This section describes how to create and use level expressions in InterSystems MDX.

Details

In InterSystems MDX, a level expression has one of the following forms:

A level literal, which is a direct reference to the level as follows:
```
[dimension_name].[hierarchy_name].[level_name]
```
Where:
- [dimension_name] is an MDX identifier that names a dimension.
- [hierarchy_name] is an MDX identifier that names a hierarchy within that dimension. You can omit the hierarchy name. If you do, the query uses the first level with the given name, as defined in this dimension.
- [level_name] is an MDX identifier that names a level within that hierarchy.
For example:
```
[gend].[h1].[gender]
```
An expression that uses an InterSystems MDX extension to refer to a level in another cube, via the following syntax:
```
[relationship_name].level_expression
```
Where relationship_name is the name of a relationship in the cube used by the query and level_expression refers to a level contained in that relationship.

You can use level expressions as arguments to the following MDX functions: