Question

我正在尝试加入2个表来查找匹配对，（例如，请参见图片）

加入条件

table1 
left join (or inner join)
table2 
on table1.metric1 = table2.metric1
and table1.metric2 = table2.metric2
and table1.metric3 = table2.metric3

我得到的结果集是

A 1 , A 2, B 1, B 2

期望的结果集---因为我想从我想要获得的表中获得唯一的对

A 1 , B 2 as my final result set.

有人可以帮我实现吗？我尝试了Rank，Partition by但没有任何作用。谢谢，

table 1         
ID  Metric1 Metric 2    Metric 3
A   x        y           z
B   x        y           z
C   p        q           r





table 2         
ID  MEtric1     Metric2 Metric3
1   x            y        z
2   x            y        z
3   l            m        n

Answer 1

这将返回示例数据的正确结果：

select *
from 
 (
   select t.*,
      row_number()
      over (partition by metric1, metric2, metric3
            order by ID) as rn1
   from table1 as t
 ) as t1
join
 (
   select t.*,
      row_number()
      over (partition by metric1, metric2, metric3
            order by ID) as rn2
   from table2 as t
 ) as t2
 on t1.metric1 = t2.metric1
and t1.metric2 = t2.metric2
and t1.metric3 = t2.metric3
and t1.rn1     = t2.rn2

不同的匹配对 - Teradata / SQL

1 个答案: