oracle listagg把一列数据变为一个字段用指定符号分隔

SQL> select listagg(page_id,',') within group (order by null)
  2  from site_html_relation
  3  /
 
LISTAGG(PAGE_ID,',')WITHINGROU
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12DBFA0AA4B247BF936D279E62A9DA26,12DBFA0AA4B247BF936D279E62A9DA26,12DBFA0AA4B247