小编use*_*911的帖子

我老了,并且总是使用"+"符号来表示外部,但是这个sql在sql server中不起作用.有人可以帮助我将以下sql转换为新的"左外连接"格式.

select frdonmst.FRID, 
       fradrmst.adrseq, 
       fax.phone   as fax, 
       phone.phone as phone 
from   frdonmst, 
       fradrmst, 
       frphnmst fax, 
       frphnmst phone 
where  frdonmst.frid = fradrmst.frid 
       and frdonmst.adrseq = fradrmst.adrseq 
       and ( frdonmst.frid = fax.frid(+) 
             and frdonmst.adrseq = fax.adrseq(+) 
             and fax.phtyp(+) = 'FAX1' ) 
       and ( frdonmst.frid = phone.frid(+) 
             and frdonmst.adrseq = phone.adrseq(+) 
             and phone.phtyp(+) = 'D1' ) 

下面是我的表的简化版本.

    FRID, RELFRID, Relationship
    123, 456, Husband/Wife
    456, 123, Wife/Husband
    345, 765, Brother/Sister
    765, 345, Sister/Brother

我想只拉一个关系的表示(只是每组两个记录中的一个).我尝试了很多东西,包括EXCEPT和SUBSELECTS,我尝试的所有东西都没有结果,因为左边的每个数字也表示在右边.知道如何获得我正在寻找的结果吗？我已经尝试了以下查询的每个组合.

    select frid, relfrid from frrelmst
    except
    select frid, relfrid from frrelmst
    where frid in (select relfrid from frrelmst)
    order by frid, relfrid

    Select frid, relfrid from frrelmst where 
    relfrid+frid not in (select frid+relfrid from frrelmst)