Last
DataWindow expression function
Description
Gets the value in the last row in the specified column.
Syntax
|
1 |
Last ( column { FOR range { DISTINCT { expres1 {, expres2 {, ... } } } } } ) |
|
Argument |
Description |
|---|---|
|
column |
The column for which you want the value of the last |
|
FOR range (optional) |
The data that will be included when the value in the
For Crosstabs, specify CROSSTAB for
For Graph and OLE objects, specify one of
|
|
DISTINCT (optional) |
Causes Last 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 value in the last row of
column. If you specify range, Last returns the value of the last row in
column in range.
Usage
If you specify range, Last determines the value of the last row in
column in range. If you specify DISTINCT, Last returns the last distinct
value in column, or if you specify expresn, the last 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.
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 last distinct value in the column named
dept_id in group 2:
|
1 |
Last(dept_id for group 2 DISTINCT) |
This expression returns the last value in the column named emp_id in
group 2:
|
1 |
Last(emp_id for group 2) |
See also