带有附加数据的 Teradata UNION

Question

假设我们有两个不同的表

Table_eBay

Id      Product      
 1      SomeProduct-1
 2      SomeProduct-2

Table_Amazon

Id      Product      
1       SomeProduct-1
2       SomeProduct-3

可以像下面这样组合吗？

表格输出

Id      Product        isEbay       isAmazon
 1      SomeProduct-1  TRUE         TRUE
 2      SomeProduct-2  TRUE         FALSE
 3      SomeProduct-3  FALSE        TRUE

Answer 1

select      row_number () over (order by Product)                as Id
           ,Product
           ,max (case tab when 'E' then 'TRUE' else 'FALSE' end) as isEbay
           ,max (case tab when 'A' then 'TRUE' else 'FALSE' end) as isAmazon

from        (           select 'E' ,Product from Table_eBay 
            union all   select 'A' ,Product from Table_Amazon
            ) t (tab,Product)

group by    Product

order by    Product
;

Answer 2

我建议使用如下完全联接：

select 
case when AMZ.product is null then EB.product else AMZ.product end as product,
case when AMZ.id is null then 'FALSE' else 'TRUE' end as isEbay,
case when EB.id is null then 'FALSE' else 'TRUE' end as isAmazon,
rownum as ID /* alternative take the last char of product */
 from AMAZON AMZ FULL OUTER JOIN EBAY EB ON
AMZ.product = EB.product;

考虑到，在您的示例中，产品 ID = 2 表示表中有 2 个不同的产品（我使用了 Oracle 的 rownum）。

问候， 塞尔吉奥