触发器简单问题
create   table   xs
(xsnum   int   primary   key,
xsname   varchar(20)   not   null,
xssex   varchar(2)   not   null)

create   table   kc
(xsnum   int   foreign   key   references   xs(xsnum),
xsname   varchar(20)   not   null,
kcnum   int   null,
kcname   varchar(20)   null)

写了个update触发器
CREATE   TRIGGER   [trixs]   ON   [dbo].[xs]  
FOR   update
AS
begin  
if   update(xsnum)   or   update   (xsname)
update   kc   set   xsnum=i.xsnum,xsname=i.xsname   from   inserted   i,deleted   d   where   kc.xsnum=d.xsnum
end

为什么我修改xs表中的xsnum,xsname时kc表只修改了xsnum而没修改到xaname?
谢谢

------解决方案--------------------
修改xs表中的xsnum时, 如果kc表中的xsnum有外键引用时会报错吧
------解决方案--------------------
--这样做就可以了(经测试)
CREATE TRIGGER [trixs] ON [dbo].[xs]
FOR update
AS
begin
if update(xsnum) or update(xsname)
update kc set xsnum=i.xsnum ,xsname=i.xsname from kc ,inserted i,deleted d where kc.xsnum=d.xsnum and kc.xsname=d.xsname
end