[英]sql merge two tables in which the common fields are not complete
在SQL Server 2008中,我有以下两个表
Table_1:
C1 C2
A TypeStringA-1
B TypeStringA-2
C TypeStringA-3
D TypeStringA-4
E TypeStringA-5
Table_2
C1 C2
A TypeStringB-1
B TypeStringB-2
D TypeStringB-3
E TypeStringB-4
我想显示以下数据:
Result
A TypeStringA-1 TypeStringB-1
B TypeStringA-2 TypeStringB-2
C TypeStringA-3 Null
D TypeStringA-4 TypeStringB-3
E TypeStringA-5 TypeStringB-4
现在我所拥有的是两个子查询和一个:
select
query1.C1
query1.C2
query2.C2
(select C1, C2
from Table_1) as query1
(select C2
from table_2) as query2
where query1.C1 = query2.C1
order by query1.C1
然而,在我的结果中逻辑上我没有我需要显示的Null数据,这是我得到的:
Result
A TypeStringA-1 TypeStringB-1
B TypeStringA-2 TypeStringB-2
D TypeStringA-4 TypeStringB-3
E TypeStringA-5 TypeStringB-4
问题是我应该使用什么来使用Null数据拍摄表格?
select coalesce(t1.C1, t2.C1)
, t1.C2
, t2.C2
from Table_1 t1
full outer join
Table2 t2
on t1.C1 = t2.C1
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.