通过表名  查询所有存在这个表的数据库 

 1   declare @tbname sysname
 2   set @tbname='tb'
 3   declare @dbname sysname,@sql nvarchar(4000),@re bit,@sql1 varchar(8000)
 4   set @sql1=''
 5   declare tb cursor for select name from master..sysdatabases
 6   open tb 
 7    fetch next from tb into @dbname
 8   while @@fetch_status=0
 9   begin
10   set @sql='set @re=case when exists(select 1 from ['
11   +@dbname+']..sysobjects where xtype=''U'' and name='''
12   +@tbname+''') then 1 else 0 end'
13   exec sp_executesql @sql,N'@re bit out',@re out
14   if @re=1 set @sql1=@sql1+' union all select '''+@dbname+''''
15   fetch next from tb into @dbname
16   end
17   close tb
18   deallocate tb
19   set @sql1=substring(@sql1,12,8000)
20       exec(@sql1)