Avg
DataWindow expression function
Description
Calculates the average of the values of the column.
Syntax
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1 |
Avg ( column { FOR range { DISTINCT { expres1 {, expres2 {, ... } } } } } ) |
|
Argument |
Description |
|---|---|
|
column |
The column for which you want the average of the data |
|
FOR range (optional) |
The data that will be included in the average. For
For Crosstabs, specify CROSSTAB for
For Graph and OLE objects, specify one of
|
|
DISTINCT (optional) |
Causes Avg to consider only the distinct values in |
|
expresn (optional) |
One or more expressions that you want to evaluate to |
Return value
The numeric datatype of the column. Returns the average of the
values of the rows in range.
Usage
If you specify range, Avg returns the average value of column in
range. If you specify DISTINCT, Avg returns the average value of the
distinct values in column, or if you specify expresn, the average of
column for each distinct value of expresn.
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.
In calculating the average, null values are ignored.
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 average of the values in the column
named salary:
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1 |
Avg(salary) |
This expression returns the average of the values in group 1 in the
column named salary:
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1 |
Avg(salary for group 1) |
This expression returns the average of the values in column 5 on the
current page:
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Avg(#5 for page) |
This computed field returns Above Average if the average salary for
the page is greater than the average salary:
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If(Avg(salary for page) > Avg(salary), "Above Average", " ") |
This expression for a graph value sets the data to the average value
of the sale_price column:
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Avg(sale_price) |
This expression for a graph value sets the data value to the average
value of the sale_price column for the entire graph:
|
1 |
Avg(sale_price for graph) |
Assuming a DataWindow object displays the order number, amount, and
line items for each order, this computed field returns the average of the
order amount for the distinct order numbers:
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1 |
Avg(order_amt for all DISTINCT order_nbr) |
See also