Count no of elements in XMLAGG

Question

Given this:
SELECT XMLELEMENT("Department",
      XMLAGG(XMLELEMENT("Employee", e.job_id||' '||e.last_name)))
   AS "Dept_list"
   FROM employees e
   GROUP BY e.department_id;How do I get the number of rows/elements for each department in as an attribute in the Department tag?
And in this one:
SELECT XMLELEMENT("Department",
   XMLAGG(XMLELEMENT("Employee",
   e.job_id||' '||e.last_name)
   ORDER BY last_name))
   as "Dept_list"    
   FROM employees e
;The real live example sql is rather big and contained in a WITH stament (where I can make the analytics count(*) within group .... but it says error when ran together with the XML stuff
ANy ideas?
Mette

Answer 1

How do I get the number of rows/elements for each department in as an attribute in the Department tag?With XMLAttributes :
SELECT XMLElement("Department",
         XMLAttributes(count(*) as "nb_emp"),
         XMLAgg(
           XMLElement("Employee", e.job_id||' '||e.last_name)
       ) AS "Dept_list"
FROM hr.employees e
GROUP BY e.department_id
And in this one:Not sure what you want for the 2nd query...
Something like this?
WITH emp_list AS (
  SELECT e.job_id,
         e.last_name,
         count(*) over(partition by e.department_id) as nb_per_dept
  FROM hr.employees e
SELECT XMLElement("Department",
         XMLAgg(
           XMLElement("Employee",
             XMLAttributes(nb_per_dept as "nb_per_dept"),
             job_id||' '||last_name
           ORDER BY last_name
       ) AS "Dept_list"    
FROM emp_list
;