求助,sql2000用index.asp把a表中的所有数据显示出来,并且b\c\d三个表...答:sql语句:select a1,a2,a3,a4 , null,null,null,null,null ,null from a union all select a.* ,b.b2,b.b3,null,null,null,null from a,b where a.a1=b.b1 union all select a.*,null,null,c.c2,c.c3,null,null from a,c where a.a1=c.c1 union all select a.*,null,null...