尝试XMLAGG像这样使用：
select
p.PeopleID,
rtrim(xmlagg(xmlelement(e, s.SiteName, ',')).extract('//text()').getclobval(), ',')
from people p
join site s on p.SiteID = s.SiteID
group by p.PeopleID;
如果您需要按特定顺序进行连接，例如按SiteId的升序排列，则order by在xmlagg中添加一个子句：
select
p.PeopleID,
rtrim(xmlagg(xmlelement(e, s.SiteName, ',')
order by s.SiteId).extract('//text()').getclobval(), ',')
from people p
join site s on p.SiteID = s.SiteID
group by p.PeopleID;
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