NVL - функция SQL Developer, как корректно перевести на Postgres

Перевожу запрос SQL Developer:

  SELECT DISTINCT
          sCall.id AS call_object_id,
                       '<a href="https://help.company.ru/sd/operator/#uuid:serviceCall$'
                    || sCall.id
                    || '">'
                    || sCall.title
                    || '</a>'
                       AS Call_link,
          sCall.title AS call_id,
          NVL (mark.code, 0) AS mark
FROM nausd40.tbl_serviceCall sCall,
          nausd40.tbl_mark mark
where    
sCall.mark = mark.id(+)

Мой перевод на Postgres:

select DISTINCT
          sCall.id AS call_object_id,
              '<a href="https://help.company.ru/sd/operator/#uuid:serviceCall$'
                    || sCall.id
                    || '">'
                    || sCall.title
                    || '</a>'
                       AS Call_link,
          sCall.title AS call_id,
          COALESCE(mark.code, 0) AS mark
FROM tbl_serviceCall sCall
left join tbl_mark mark on (sCall.mark = mark.id)

Выдает ошибку:

SQL Error [42804]: ERROR: COALESCE types character varying and integer cannot be matched

Подскажите, что сделал не так.