在oracle問題中左外連接

Question

在下面的此查詢中，我需要左外部連接才能起作用，以便所得數據集包含與b.terr_num匹配和不匹配的a.terr_num的所有值。

無論如何這是行不通的..請幫助

select   b.sales_regn, b.sales_area,  b.terr_num, a.terr_num,  a.terr_name
from     kp_terr_region b
         left outer join  kap_terr  a on a.terr_num = b.terr_num
where    a.valid_to > sysdate
and      a.ptr_type = 'JPN'
and      a.status != 1
and      a.valid_to > sysdate
and      b.valid_to > sysdate
and      a.slr_num is null;

Answer 1

如果我正確理解了您的問題，則說明您在使用where條件否定outer join聯接。 此舉標准的join ，而不是：

select   b.sales_regn, b.sales_area,  b.terr_num, a.terr_num,  a.terr_name
from     kp_terr_region b
     left outer join  kap_terr  a on a.terr_num = b.terr_num
         and a.valid_to > sysdate
         and a.ptr_type = 'JPN'
         and a.status != 1
         and a.slr_num is null
where b.valid_to > sysdate