sql语句怎么写，把一个数据表里的所有字段都改成varchar类型
------解决方案--------------------
create proc to_var(@t varchar(200))
as
declare @e varchar(8000)
select @e= ' '
select @[email protected]+ 'alter table '[email protected]+ ' alter column ' +name+ ' varchar(200) ' from syscolumns where id=object_id(@t)
exec (@e)
to_var '表名 '