Handling of Numeric Value
Next, let's explore the handling of omitted numeric values,
among the other "default" treatments that the Head() function
doles out. We can see these treatments in action by simulating some quick
scenarios.
1.
Within the
query we have saved as MDX19-1, replace the top comment line of the
query with the following:
-- MDX019-2, Use of Head() Function - Omitted Numeric Expression
2.
Save the query
as MDX19-2, to prevent damaging MDX19-1.
3.
Remove the comma
(",") and numeral 3 from the following line of the query:
{Head([Time].[1998].Children, 3)} ON COLUMNS,The
Query pane
appears as shown in Illustration 2.
4.
Execute the
query by clicking the Run Query button in the toolbar.
The
Results pane is
populated, and the dataset shown in Illustration 3 appears.
Illustration 3: Result Dataset - Head() Function with
Omitted Numerical Expression
5.
Re-save the
file as MDX19-2.
6.
Leave the query
open for the next step.
We see
that the "default" value assumed by the function, in the absence of a
specified numeric expression, is 1. Q1 only is returned, on the
column axis, as a result.
7.
Within the
query we have saved as MDX19-2, replace the top comment line of the
query with the following:
-- MDX019-3, Use of Head() Function -Numeric Expression < 1
8.
Save the query
as MDX19-3.
9.
Add a comma (",")
after .Children, then a space, and then the numeral -1, into
the following line of the query:
{Head([Time].[1998].Children)} ON COLUMNS,The
Query pane
appears as shown in Illustration 4, with the inserted coding circled in
red.
Illustration 4: The Query with Numerical Expression Less
Than 1
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