Max – PB Docs 150

Max DataWindow expression function

Description

Gets the maximum value in the specified column.

Syntax

Argument

Description

column

The column for which you want the maximum
value. Column can be the column name or the
column number preceded by a pound sign (#). Column can
also be an expression that includes a reference to the column. The
datatype of column must be numeric.

FOR range (optional)

The data that will be included when the
maximum value is found. For most presentation styles, values for range are:

  • ALL – (Default)
    The maximum value of all rows in column.

  • GROUP n – The maximum
    value of rows in column in the specified group.
    Specify the keyword GROUP followed by the group number: for example,
    GROUP 1.

  • PAGE – The maximum value of the rows in column on
    a page.

For Crosstabs, specify CROSSTAB for range:

  • CROSSTAB – (Crosstabs
    only) The maximum value of all rows in column in
    the crosstab.

For Graph and OLE objects, specify one of the following:

  • GRAPH – (Graphs
    only) The maximum value in column in the range
    specified for the Rows option.

  • OBJECT – (OLE objects only) The maximum
    value in column in the range specified for
    the Rows option.

DISTINCT (optional)

Causes Max to consider
only the distinct values in column when determining
the largest value. For a value of column, the
first row found with the value is used and other rows that have
the same value are ignored.

expresn (optional)

One or more expressions that you want
to evaluate to determine distinct rows. Expresn can
be the name of a column, a function, or an expression.

Return Values

The datatype of the column. Returns the maximum value in the
rows of column. If you specify range, Max returns
the maximum value in column in range.

Usage

If you specify range, Max determines
the maximum value in column in range. If
you specify DISTINCT, Max returns the maximum
distinct value in column, or if you specify expresn,
the maximum distinct value in column where
the value of expresn is distinct.

For graphs and OLE objects, you do not select the range when
you call the function. The range has already been determined by
the Rows setting on the Data property page (the Range property),
and the aggregation function uses that range. Settings for Rows
include the following:

  • For the Graph or OLE presentation
    style, Rows is always All.

  • For Graph controls, Rows can be All, Page, or Group.

  • For OLE controls, Rows can be All, Current Row,
    Page, or Group. The available choices depend on the layer the control
    occupies.

Null values are ignored and are not considered in determining
the maximum.

note.png Not in validation rules or filter expressions

You cannot use this or other aggregate functions in validation
rules or filter expressions.

Using an aggregate function cancels the effect of setting
Retrieve Rows As Needed in the painter. To do the aggregation, a DataWindow object always retrieves
all rows.

Examples

This expression returns the maximum of the values
in the age column on the page:

This expression returns the maximum of the values
in column 3 on the page:

This expression returns the maximum of the values
in the column named age in group 1:

Assuming a DataWindow object displays the order number,
amount, and line items for each order, this computed field returns
the maximum of the order amount for the distinct order numbers:

See Also

  • Min

  • Max in the PowerScript Reference


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