Max DataWindow expression function
Description
Gets the maximum value in the specified column.
Syntax
1 |
<span>Max</span> ( <span>column</span> { FOR <span>range </span>{ DISTINCT { <span>expres1</span> {, <span>expres2</span> {, ... } } } } } ) |
Argument |
Description |
---|---|
column |
The column for which you want the maximum |
FOR range (optional) |
The data that will be included when the
For Crosstabs, specify CROSSTAB for range:
For Graph and OLE objects, specify one of the following:
|
DISTINCT (optional) |
Causes Max to consider |
expresn (optional) |
One or more expressions that you want |
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.
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:
1 |
<span>Max</span>(age for page) |
This expression returns the maximum of the values
in column 3 on the page:
1 |
<span>Max</span>(#3 for page) |
This expression returns the maximum of the values
in the column named age in group 1:
1 |
<span>Max</span>(age for 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:
1 |
<span>Max</span>(order_amt for all DISTINCT order_nbr) |
See Also
-
Max in the PowerScript Reference