
SELECT STUFF((SELECT ','+KR_CHILDSTR FROM KindRelation WHERE KR_OBJECTTYPE=8 AND KR_OBJECTID=3 AND KR_OBJECTID2=81 FOR XML PATH(''),TYPE).value('.','NVARCHAR(MAX)'),1,1,'')

上面语句既能满足行字符串拼接,又能去除XML格式,比如大于号、小于号,归功于后面的这部分代码
,TYPE).value('.','NVARCHAR(MAX)')