queryNew Help in coldfusion

I need help creating a query in coldfusion. I have 2 loops. I will give me an ID. But the second loop must create as many columns as loop recordcount is.Instead i getting an error message

The column name (mydata_1) that you specified already exists in this query.
Column names must be unique.  
myQueryTest = QueryNew("");
var IDArr = ArrayNew(1);
for (k = 1;k lte ArrayLen(List);k++) {
var locID = list[k];
  QueryAddRow(myQueryTest );
  IDArr[k] = locID;
var myDataArr = ArrayNew(1);

for (kk = 1;kk lte ArrayLen(DataColumns);kk++) {
 
nColumnNumber= QueryAddColumn(myQueryTest,"mydata_#k#_#kk#","VarChar",myDataArr);      
}



}
nColumnNumber= QueryAddColumn(myQueryTest, "ID", "VarChar", IDArr);
LVL 19
erikTsomikSystem Architect, CF programmer Asked:
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_agx_Commented:
If only the "ID" column is populated, you don't need all that.  Just generate the dynamic columns first:

     myQueryTest = queryNew();
     emptyArray = [];
     for (kk = 1;kk lte ArrayLen(DataColumns);kk++) {
        QueryAddColumn(myQueryTest,"mydata_#k#_#kk#","VarChar", emptyArray );      
     }

Then use the #list# array to add and populate the "ID" column

        QueryAddColumn(myQueryTest, "ID","VarChar", list);
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_agx_Commented:
> myQueryTest = queryNew();

Oops, obviously add quotes there :)  ie QueryNew("")
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