Xmltable fn:string-join

Question

create table emp (doc XMLtype);
insert into emp values(
xmltype('<dept bldg="114">
     <employee id="903">
          <name>
               <first>Mary</first>
               <last>Jones</last>
          </name>
          <office>415</office>
          <phone>905-403-6112</phone>
          <phone>647-504-4546</phone>
          <salary currency="USD">64000</salary>
     </employee>
</dept>'));
I need the output to be
Mary Jones 905-403-6112,647-504-4546
I tried
SELECT X.* FROM emp ,
XMLTABLE ('$d/dept/employee' passing doc as "d"
     COLUMNS
     first VARCHAR2(25) PATH 'name/first',
     last VARCHAR2(25) PATH 'name/last',
     phone VARCHAR2(100) PATH 'fn:string-join(phone/text(),",")'
) AS X
and received error
ORA-31011: XML parsing failed
ORA-19202: Error occurred in XML processing
LPX-00601: Invalid token in: '/*/fn:string-join(phone/text(),",")'
please advise. thanks.

Answer 1

SCOTT@soti_10> with emp as(
  2    select xmltype(
  3           '
  4            <dept>
  5              <employee id="901">
  6                <name>
  7                  <first>John</first>
  8                  <last>Doe</last>
  9                </name>
10              </employee>
11              <employee id="902">
12                <name>
13                  <first>Peter</first>
14                  <last>Pan</last>
15                </name>
16                <phone>905-416-5004</phone>
17              </employee>
18              <employee id="903">
19                <name>
20                  <first>Mary</first>
21                  <last>Jones</last>
22                </name>
23                <phone>905-403-6112</phone>
24                <phone>647-504-4546</phone>
25              </employee>
26            </dept>
27           '
28           ) as doc
29    from dual
30  )
31  SELECT X.*
32  FROM emp ,
33    XMLTABLE (
34      'for $e in $d/dept/employee,
35           (: $pi - index of the current phone element.
36              If there is no phone elements at all then $pi = 0, otherwise $pi > 0 :)
37           $pi in (0 to fn:count($e/phone))[. > 0 or fn:last() = 1]
38       return <e>
39                {$e/name}
40                {$e/phone[$pi]}
41              </e>'
42      passing doc as "d"
43      COLUMNS first VARCHAR2(25) PATH 'name/first',
44              last VARCHAR2(25) PATH 'name/last',
45              phone VARCHAR2(100) PATH 'phone'
46    ) AS X
47  ;
FIRST                     LAST                      PHONE
John                      Doe
Peter                     Pan                       905-416-5004
Mary                      Jones                     905-403-6112
Mary                      Jones                     647-504-4546Regards,
Dima