显示数据库表间的外键关系

select foreign_key=b.name,
       foreign_key_table=c.name,
       foreign_key_columns
         =isnull((select name from syscolumns
                  where id=c.id and colid=a.fkey1),'')
         +isnull((select ','+name from syscolumns
                  where id=c.id and colid=a.fkey2),'')
         +isnull((select ','+name from syscolumns
                  where id=c.id and colid=a.fkey3),'')
         +isnull((select ','+name from syscolumns
                  where id=c.id and colid=a.fkey4),'')
         +isnull((select ','+name from syscolumns
                  where id=c.id and colid=a.fkey5),'')
         +isnull((select ','+name from syscolumns
                  where id=c.id and colid=a.fkey6),'')
         +isnull((select ','+name from syscolumns
                  where id=c.id and colid=a.fkey7),'')
         +isnull((select ','+name from syscolumns
                  where id=c.id and colid=a.fkey8),'')
         +isnull((select ','+name from syscolumns
                  where id=c.id and colid=a.fkey9),'')
         +isnull((select ','+name from syscolumns
                  where id=c.id and colid=a.fkey10),'')
         +isnull((select ','+name from syscolumns
                  where id=c.id and colid=a.fkey11),'')
         +isnull((select ','+name from syscolumns
                  where id=c.id and colid=a.fkey12),'')
         +isnull((select ','+name from syscolumns
                  where id=c.id and colid=a.fkey13),'')
         +isnull((select ','+name from syscolumns
                  where id=c.id and colid=a.fkey14),'')
         +isnull((select ','+name from syscolumns
                  where id=c.id and colid=a.fkey15),'')
         +isnull((select ','+name from syscolumns
                  where id=c.id and colid=a.fkey16),''),
       primary_key_table=d.name,
       primary_key_columns
         =isnull((select name from syscolumns
                  where id=d.id and colid=a.rkey1),'')
         +isnull((select ','+name from syscolumns
                  where id=d.id and colid=a.rkey2),'')
         +isnull((select ','+name from syscolumns
                  where id=d.id and colid=a.rkey3),'')
         +isnull((select ','+name from syscolumns
                  where id=d.id and colid=a.rkey4),'')
         +isnull((select ','+name from syscolumns
                  where id=d.id and colid=a.rkey5),'')
         +isnull((select ','+name from syscolumns
                  where id=d.id and colid=a.rkey6),'')
         +isnull((select ','+name from syscolumns
                  where id=d.id and colid=a.rkey7),'')
         +isnull((select ','+name from syscolumns
                  where id=d.id and colid=a.rkey8),'')
         +isnull((select ','+name from syscolumns
                  where id=d.id and colid=a.rkey9),'')
         +isnull((select ','+name from syscolumns
                  where id=d.id and colid=a.rkey10),'')
         +isnull((select ','+name from syscolumns
                  where id=d.id and colid=a.rkey11),'')
         +isnull((select ','+name from syscolumns
                  where id=d.id and colid=a.rkey12),'')
         +isnull((select ','+name from syscolumns
                  where id=d.id and colid=a.rkey13),'')
         +isnull((select ','+name from syscolumns
                  where id=d.id and colid=a.rkey14),'')
         +isnull((select ','+name from syscolumns
                  where id=d.id and colid=a.rkey15),'')
         +isnull((select ','+name from syscolumns
                  where id=d.id and colid=a.rkey16),''),
       cascade_update=case when (b.status/8192)%2=1 then 'Y' else '' end,
       cascade_delete=case when (b.status/4096)%2=1 then 'Y' else '' end
  from sysreferences a,sysobjects b,sysobjects c,sysobjects d
  where b.parent_obj in(select id from sysobjects
                        where xtype='U' and name<>N'dtproperties')
    and a.constid=b.id
    and a.fkeyid=c.id
    and a.rkeyid=d.id
  order by foreign_key_table,foreign_key_columns