What is proper syntax for using PassBack in a Report page select statement

Question

In my select statement I reference the passBack function using:
onClick="javascript:passBack()"
In my Page Header I (Typically) define the passBack function as:
<script language="JavaScript" type="text/javascript">
function passBack(passVal1,passVal2) {
opener.document.getElementById("P2000_CABLE_ID").value = passVal1;
opener.document.getElementById("P2000_CABLE_LABEL").value = passVal2;
window.opener.location.reload(true);
</script>
But I have never used the passBack function from the Select statement before and cannot happen onto the proper syntax.
The Page Items I want to pass are:
1. :P2004_CABLE_ID
2. :P2004_LABEL
I want to pass them to:
1. :P2000_CABLE_ID
2. :P2000_CABLE_LABEL
Can someone please help me out... Again?
Thanks- Gary

Answer 1

Let's assume column XYZ has both numbers (1), and letters (any alphabet).
I have a case statement on SQL to turn any value that's not 1 into 0, then I am getting a sum of that column.
I am also grouping by Row A, B etc to get aggregated sum of column XYZ for those group.
Now on Crystal Reports function, I need to sum up values under column XYZ for all the groups.
If I try using sum function like below, I get an error stating:
"A number field or currency amount field is required here"
(sum({Command.XYZ}))
So I thought if I can use a case statement to change the non-numbers to 0 prior to sum that will probably resolve it. But I could not get the below case statement to work either (Error: A string is required). 
SELECT {Command.XYZ}
   Case 1:
      1 
   Default:
      0;