SQL合并查询
SQL Query for Consolidation
我需要一点帮助...
我有两个数据表:
Table 编程电路(理论行程)
Table 个卖家涵盖的线路(实际行程)
要达到的结果:
谢谢...
select isnull(a.date, b.date), isnull(a.seller, b.seller), a.[theoretical itinerary], b.[real itinerary]
from table1 a full join table2 b
on a.date=b.date and a.seller=b.seller
我想你想要full join
:
select coalesce(t.date, r.date) as date, coalesce(t.seller, r.seller) as seller,
t.itinerary as theoretical_itinerary,
r.itinerary as real_itinerary
from theoretical t full join
real r
on t.date = r.date and t.seller = r.seller;
coalesce()
是使用 full join
的不幸产物。如果您不包含它,那么您将看到匹配列的 NULL
值。 (如果只有 SQL 服务器支持 using
,那么会有一个简单的替代方案。)
我需要一点帮助...
我有两个数据表:
Table 编程电路(理论行程)
select isnull(a.date, b.date), isnull(a.seller, b.seller), a.[theoretical itinerary], b.[real itinerary]
from table1 a full join table2 b
on a.date=b.date and a.seller=b.seller
我想你想要full join
:
select coalesce(t.date, r.date) as date, coalesce(t.seller, r.seller) as seller,
t.itinerary as theoretical_itinerary,
r.itinerary as real_itinerary
from theoretical t full join
real r
on t.date = r.date and t.seller = r.seller;
coalesce()
是使用 full join
的不幸产物。如果您不包含它,那么您将看到匹配列的 NULL
值。 (如果只有 SQL 服务器支持 using
,那么会有一个简单的替代方案。)