Syntax

Head ( set [,numeric value expression ] )

Parameters

set

The set from which to take items.

numeric value expression

The count of items to take from the beginning of the set. If omitted, the default is 1. If less than 1, an empty set is returned. If the value exceeds the number of tuples in the input set, the original set is returned.

Example 1

This example uses the following part of the Sample Basic outline:

The following expression:

[Product].children

returns the set:

{ [100], [200], [300], [400], [Diet] }

Therefore, the following expression:

 Head (
  [Product].children, 2) 

returns the first two members of the previous result set:

{ [100], [200] }

Example 2

This example uses the following parts of the Sample Basic outline:

The following expression:

 CrossJoin ( [100].children, [South].children )

returns the set:

{ ([100-10], Texas), ([100-10], Oklahoma), ([100-10], Louisiana), ([100-10], [New Mexico]),
  ([100-20], Texas), ([100-20], Oklahoma), ([100-20], Louisiana), ([100-20], [New Mexico]),
  ([100-30], Texas), ([100-30], Oklahoma), ([100-30], Louisiana), ([100-30], [New Mexico]) }

And the following expression:

Head ( CrossJoin ([100].children, [South].children), 8 )

returns the first 8 tuples of the previous result set:

{ ([100-10], Texas), ([100-10], Oklahoma), ([100-10], Louisiana), ([100-10], [New Mexico]),
  ([100-20], Texas), ([100-20], Oklahoma), ([100-20], Louisiana), ([100-20], [New Mexico]) } 

Additionally, the following expression:

([Year].generations(2).members)

returns the set of members comprising the second generation of the Year dimension:

{ [Qtr1], [Qtr2], [Qtr3], [Qtr4] }

Therefore, the following query:

SELECT
  {([Year].generations(2).members)}
ON COLUMNS,
Head (
 CrossJoin (
  [100].children, [South].children), 8
     ) 
ON ROWS
FROM Sample.Basic 

returns the grid:

See Also

Tail