How to do this?.

<cfquery name="sel_q" datasource="#dsn#" username="#user#" password="#pass#">
select deptid from tbl_dept
</cfquery>

I am displaying this inside a cfoutput...so i don't need cfoutput for this.

#sel_q.deptid#


How can i display all values from query result in this format

10,11,13

do i need to use query loop for this or we have some function for this?.