Choose Function Example

Choose function in MS Access: Have you ever had to create several reports that were almost identical but had different order for the columns and a different sort order?

Many of these reports can be done in one intelligent report and query combination with the Access Command: Choose function.

Access Choose function query example setup: We have a form called Form1. On Form1 are two combo boxes (Field1_Combo, Field2_Combo), and a 'Preview Report' button:

Access Choose Function

Both combo boxes have the same Row Source. Note that there are two columns in the row source; the first is a number (1, 2) and the second is the name of the field to be included in the report and sorted by.

New! Download Choose Function Command Demonstration Database.

The choose code looks like this:

Access choose command example Access choose function

Note that we will always retrieve the employee's Pay_Rate field, however this could be variable as well. You'll also need to see the example code for the query to see how the Order By clause works for this Access choose command example:

SELECT
Choose(Val([forms]![form1]![field1_combo]),[SSN],[Employee_No]) AS Field1,
Choose(Val([forms]![form1]![field2_combo]),[SSN],[Employee_No]) AS Field2,
M_Emp_Pay.Pay_Rate
FROM M_Emp_Pay
ORDER BY
Choose(Val([forms]![form1]![field1_combo]),[SSN],[Employee_No]),
Choose(Val([forms]![form1]![field2_combo]),[SSN],[Employee_No]);

Here's the resulting report using the choose function:

Choose function example

The second trick is how I got the column headings to come out correctly... All that's required is one line of VBA code for each label.. but before I show that here is the design view of the report:>

Choose Function in Access

Ok, let's see how the VBA code assigns the correct values to the labels:

Option Compare Database

Private Sub PageHeaderSection_Format(Cancel As Integer, FormatCount As Integer)

Me.Field1_Label.Caption = Replace(Forms![form1]![Field1_Combo].Column(1), "_", " ")
Me.Field2_Label.Caption = Replace(Forms![form1]![Field2_Combo].Column(1), "_", " ")

End Sub

Don't be confused by the Replace function command... all that does is get rid of underscore character in the field name (Employee_No to Employee No).

Using the Access Choose function query can be extended to numerous fields and could probably be used for aggregate functions too, but I haven't tried that yet. The alternative to using the Access Choose command is to write many lines of VBA code in the report or behind the parameter form (Form1).

You can also use the choose function to pass parameters to an Access Query.