我正在尝试使用XML PATH连接查询中某些字符串数据的结果

请参阅下面的查询，发生的情况是XML串联列语句被截断了，似乎最大长度有限制，我该如何克服。

select SUBSTRING(statement,1,len(statement)-2)+';'
from(
select 
'update '+tab.table_name +' set ' +
(
select 
col.COLUMN_NAME +'=replace('+col.column_name+',''@xx'',''yy'') ,'+CHAR(10) 
from INFORMATION_SCHEMA.COLUMNS as col
where  tab.TABLE_CATALOG=col.TABLE_CATALOG
and tab.TABLE_SCHEMA=col.TABLE_SCHEMA
and tab.TABLE_NAME=col.TABLE_NAME
and col.DATA_TYPE in('VARCHAR','NVARCHAR')
for xml path('') )  as statement
from information_schema.TABLES as tab
) as x
where statement is not null