"Invalid Column" on multiple where clauses with subqueries and cfqueryparam

Question

I'm seeing a behavior in the coldfusion cfquery that I'd like to find an exmplanation for .  I've got a query that does a subquery in the select portion and if I have multiple where lines, I get an "invalid column name" message for my second where clause, but only when I'm using cfqueryparam
For example on the following I get "Invalid column name 'position_id'"
SELECT   department_staff_tbl.*,
         (   SELECT   max(bookmark_id)
             FROM     bookmarked_items_tbl
             WHERE    item_id = department_staff_tbl.staff_id
         ) AS bookmark_id
FROM     department_staff_tbl
WHERE    department_id = <cfqueryparam value="#arguments.deptid#"  cfsqltype="cf_sql_integer">
AND     position_id   = <cfqueryparam value="#arguments.posid#"   cfsqltype="cf_sql_integer">
AND     staff_id      = <cfqueryparam value="#arguments.staffid#" cfsqltype="cf_sql_integer">
If I change the order of my where clause so staff_id is first, then it tells me "department_id" is an invalid column.
If I only have one where clause, it works.  (i.e. WHERE position_id = <cfqueryparam value="#arguments.posid#" cfsqltype="cf_sql_integer">).
If I remove the where clause from my subquery (WHERE     item_id = department_staff_tbl.staff_id) it works.
It also works if I remove the cfqueryparam from my where clause so that my query looks like this:
SELECT   department_staff_tbl.*,
         (   SELECT   max(bookmark_id)
             FROM     bookmarked_items_tbl
             WHERE    item_id = department_staff_tbl.staff_id
         ) AS bookmark_id
FROM     department_staff_tbl
WHERE    department_id = #arguments.deptid#
AND     position_id   = #arguments.posid#
AND     staff_id      = #arguments.staffid#
Any thoughts?

Answer 1

I see two tables. So can the server. So, use qualified column-names.
SELECT   department_staff_tbl.*,
         (   SELECT   max(bookmarked_items_tbl.bookmark_id)
             FROM     bookmarked_items_tbl
             WHERE    bookmarked_items_tbl.item_id = department_staff_tbl.staff_id
         ) AS bookmark_id
FROM     department_staff_tbl
WHERE    department_staff_tbl.department_id = <cfqueryparam value="#arguments.deptid#"  cfsqltype="cf_sql_integer">
AND      department_staff_tbl.position_id   = <cfqueryparam value="#arguments.posid#"   cfsqltype="cf_sql_integer">
AND      department_staff_tbl.staff_id      = <cfqueryparam value="#arguments.staffid#" cfsqltype="cf_sql_integer">