Presto SQL - 两个完全不同的表连接平行而不是垂直

Question

我有两张表，其中包含完整的数据集和标题。

我设法连接在一起，但使用下面的代码，但这是垂直组合。

QUERY = """
SELECT SUM(CAST(US.amount as DECIMAL(13,2))) filter (where type IN ('USA')) as "USA Net Amount" from da1.tb1 
UNION 
SELECT SUM(CAST(EU.amount as DECIMAL(13,2))) filter (where type IN ('EU')) as "EU Net Amount" from da2.tb2
"""
results = fetch_data(QUERY)
display(results)
results.to.csv('output.csv',index=False)

下面是我的输出，第二行是欧盟净额输出。

USA Net Amount
50.00
100.00

我想要实现的东西，欧元净额输出为新的第二列。

USA Net Amount	EU Net Amount
50.00	100.00

Answer 1

select t1."USA Net Amount", t2."EU Net Amount"
FROM
    (SELECT SUM(CAST(US.amount as DECIMAL(13,2))) filter (where type IN ('USA')) as "USA Net Amount"
     from da1.tb1) t1
CROSS JOIN
    (SELECT SUM(CAST(EU.amount as DECIMAL(13,2))) filter (where type IN ('EU')) as "EU Net Amount"
     from da2.tb2) t2

不过，不知道这个语法是否支持？

符合 SQL-2016 使用了 SQL-2016 之外的以下功能： T612，高级 OLAP 操作 T611，基本 OLAP 操作 F591，派生表 F401，扩展连接表

Answer 2

在 UNION ALL 中的查询中添加类型列（这里需要 UNION ALL，而不是 UNION）来指示国家和使用条件聚合：

select max(AMT) FILTER(WHERE type="USA") as "USA Net Amount", 
       max(AMT) FILTER(WHERE type="EU") as "EU Net Amount"
from      
(
    --aggregation in union ALL can be executed in parallel
    SELECT SUM(CAST(US.amount as DECIMAL(13,2)))  as Amt, type from da1.tb1 where type IN ('USA') group by type
    UNION ALL ---not UNION !
    SELECT SUM(CAST(EU.amount as DECIMAL(13,2)))  as Amt, type from da2.tb2 where type IN ('EU')  group by type
) as s

或在 UNION ALL 之后使用单个聚合步骤：

select sum(AMT) FILTER(WHERE type="USA") as "USA Net Amount", 
       sum(AMT) FILTER(WHERE type="EU") as "EU Net Amount"
from      
(
    SELECT CAST(US.amount as DECIMAL(13,2)) as Amt, type from da1.tb1 where type IN ('USA')
    UNION ALL ---not UNION !
    SELECT CAST(EU.amount as DECIMAL(13,2))  as Amt, type from da2.tb2 where type IN ('EU')
) as s