Sum DataWindow expression function

Description

Calculates the sum of the values in the specified column.

Syntax

<span>Sum</span> ( <span>column</span> { FOR <span>range</span> { DISTINCT { <span>expres1</span> {, <span>expres2</span>  {, ... } } } } } )

1	<span>Sum</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 sum of the data values. 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 to be included in the sum. For most presentation styles, values for range are: ALL – (Default) The sum of all values in column. GROUP n – The sum of values in column in the specified group. Specify the keyword GROUP followed by the group number: for example, GROUP 1. PAGE – The sum of the values in column on a page. For Crosstabs, specify CROSSTAB for range: CROSSTAB – (Crosstabs only) The sum of all values in column in the crosstab. For Graph and OLE objects, specify one of the following: GRAPH – (Graphs only) The sum of values in column in the range specified for the Rows option of the graph. OBJECT – (OLE objects only) The sum of values in column in the range specified for the Rows option of the OLE object.
DISTINCT (optional)	Causes Sum to consider only the distinct values in column when determining the sum. 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 appropriate numeric datatype. Returns the sum of the data
values in column.

Usage

If you specify range, Sum returns
the sum of the values in column within range.
If you specify DISTINCT, Sum returns the sum
of the distinct values in column, or if you
specify expresn, the sum of the values of 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 included in the calculation.

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 sum of the values in
group 1 in the column named salary:

<span>Sum</span>(salary for group 1)

1	<span>Sum</span>(salary for group 1)

This expression returns the sum of the values in
column 4 on the page:

<span>Sum</span>(#4 for page)

1	<span>Sum</span>(#4 for page)

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

<span>Sum</span>(order_amt for all DISTINCT order_nbr)

1	<span>Sum</span>(order_amt for all DISTINCT order_nbr)

Sum – PB Docs 126