如何使用 Hive 在同一个 table 上合并两列

Question

现在我有：

Scorecard	team1	team2	Winner	Margin	Ground	Match Date	Year
ODI # 1	Australia	England	Australia	5 wickets	Melbourne	5-Jan-71	1971
ODI # 2	England	Australia	England	6 wickets	Manchester	24-Aug-72	1972
ODI # 3	England	Australia	Australia	5 wickets	Lord's	26-Aug-72	1972
ODI # 4	England	Australia	England	2 wickets	Birmingham	28-Aug-72	1972
ODI # 5	New Zealand	Pakistan	New Zealand	22 runs	Christchurch	11-Feb-73	1973

而我想要的是组合 team1 和 team2 然后得到远程列表

基于我上面的示例：

我正在使用 Cloudera Hive - 我正在尝试让工会工作。

我也试过：

SELECT concat_ws('^',(SPLIT('${team1,team2}',',')));

但是，输出只是给我： ${team1^team2}

Answer 1

最简单的方法是使用 union:

select team1 as teams from tablename
union distinct
select team2 from tablename

这是使用子查询的另一种方式：

Select distinct teams from (
select team1 as teams from tablename
union
select team2 from tablename 
) t

How to combine two columns on the same table using Hive