Syntax

Union ( set1, set2 [,ALL] )

Parameters

set1

A set to join with set2.

set2

A set to join with set1.

ALL

If the optional ALL keyword is used, duplicates are retained.

Notes

Duplicates are eliminated by default from the tail of the set. The optional ALL keyword retains duplicates. The two input sets must have identical dimension signatures. For example, if set1 consists of dimensions Product and Market, in that order, then set2 should also consist of Product followed by Market.

Example 1

The following MDX expression:

Union( Siblings([Old Fashioned]), {[Sarsaparilla], [Birch Beer]}) 

returns the set:

{ [Old Fashioned], [Diet Root Beer], [Sarsaparilla], [Birch Beer] }

Example 2

The following MDX expression:

Union( Siblings([Old Fashioned]), {[Sarsaparilla], [Birch Beer]}, ALL)

returns the set:

{ [Old Fashioned], [Diet Root Beer], [Sarsaparilla], [Birch Beer],
      [Sarsaparilla], [Birch Beer] }

Example 3

The following MDX query:

SELECT
CrossJoin (
         Union (
            Siblings ([Old Fashioned]),
            {([Root Beer]), ([Cream Soda])}
         ),
         {(Budget), ([Variance])}
      )
ON COLUMNS
from Sample.Basic

returns the output: