大家给我 看看这条sql错哪了，该如何写，在线等！！！
update opendatasource(
'sqloledb ',
'data source=www.yy.net;user id=sa;password= '
).xg.dbo.kroa_wuliu_ruku as y
set lei=1
from kroa_wuliu_ruku as b
set b.pinming=y.pinming and b.kuwei=y.kuwei and b.pihao=y.pihao and
(b.lei <> y.lei )
为什总提示：
在关键字 'as ' 附近有语法错误。

[解决办法]
from kroa_wuliu_ruku as b
where --这里不是set


[解决办法]
--try

update y
set lei=1
from opendatasource(
'sqloledb ',
'data source=www.yy.net;user id=sa;password= '
).xg.dbo.kroa_wuliu_ruku as y inner join kroa_wuliu_ruku as b
on b.pinming=y.pinming and b.kuwei=y.kuwei and b.pihao=y.pihao and
(b.lei <> y.lei )
[解决办法]
update opendatasource(
'sqloledb ',
'data source=www.yy.net;user id=sa;password= '
).xg.dbo.kroa_wuliu_ruku
set lei=1
from opendatasource(
'sqloledb ',
'data source=www.yy.net;user id=sa;password= '
).xg.dbo.kroa_wuliu_ruku as y ,kroa_wuliu_ruku as b
where b.pinming=y.pinming and b.kuwei=y.kuwei and b.pihao=y.pihao and
(b.lei <> y.lei )