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Follow up on the Text "ccon" field Logic

Last Modified: 2012-06-27
This question is a continuation of a related question.

tblMain.ccon is a text field of "Yes" and "No" TEXT. It's not a checkbox, it's in fact a Text field.

How can I "swap or re-create" this line .... "iif ( (sum( iif( nz([CCon],'No') = 'Yes' , 1, 0))) > 0 , 1, 0) + sum ( iif( nz([CCon],'No') = 'Yes' , 0, 1))..."

...... into the Query in code snippet such that it changes the query from a "checkbox" type to a "Text" type "Yes and No" TEXT
such that the query will still output same result as if it's a checkbox. The query in code snippet is from one of my old EE posts

"GetGroupIDNameCourseType" is a Public Function in my db. If the above "Yes and No" logic is properly swapped or defined, the function and my query should work just fine.

However if a sample db is still required here for visualization, please request it and I will upload it.
SELECT SUBQ.GroupID, SUBQ.CourseGroup, SUBQ.SType, sum( SUBQ.CountOfRID ) AS CountOfRID, "V004C" AS query_version
GetGroupIDNameCourseType(tblcourse.Course,tblmain.stypeid) AS GroupID,[Course] AS CourseGroup,  tblSType.SType,   
iif( NZ([tblMain].[CCon],False)=True,-1,tblmain.rid) as ccongroup, sum( iif( NZ([tblMain].[CCon],False)=True,0,1)) + max( iif( NZ([tblMain].[CCon],False)=True,1,0))  AS CountOfRID, tblmain.groupid as individual_groupid

FROM ((tblMain INNER JOIN tblCourse ON tblMain.CourseID = tblCourse.CourseID) 
inner join tblSType on tblSType.STypeID = tblmain.STypeid)
WHERE tblMain.Appdate >=[forms]![frmReportDateRange]![BeginDate] And tblMain.Appdate<=[forms]![frmReportDateRange]![EndDate]
GetGroupIDNameCourseType(tblcourse.Course,tblmain.stypeid),[Course],  tblSType.SType,   
iif( NZ([tblMain].[CCon],False)=True,-1,tblmain.rid), tblmain.groupid

GROUP BY SUBQ.GroupID, SUBQ.CourseGroup, SUBQ.stype;

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