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