Oracle-SQL 加入重复的列但避免重复的行

Question

我有 table 1 个这样的：

id	Country
1	Germany
1	USA
1	Japan
2	France

Table 2 个这样

id	Color
1	Green
2	Red
2	Yellow

是否可以使用 SQL 语句得到这样的结果？:

id	Country	Color
1	Germany	Green
1	USA
1	Japan
2	France	Red
2		Yellow

这意味着，如果 id 1 有 3 个国家和 1 种颜色 --> 结果应该 return 只有 3 个国家和 1 种颜色，顺序任意（并且颜色可以与任何国家在同一行).一般来说，如果 id 1 有 m 个国家和 n 种颜色 --> 结果应该 return 只有 m 个国家和 n 种颜色？非常感谢 <3

注意：我使用的是 Oracle 数据库

Answer 1

您可以对每个 ID 的国家和颜色进行编号，然后对 ID 和该编号使用完全外部联接：

with cntr as
(
  select id, row_number() over (partition by id order by country) as subid, country
  from country
)
, clr as
(
  select id, row_number() over (partition by id order by color) as subid, color
  from color
)
select id, cntr.country, clr.color
from cntr full outer join clr using (id, subid)
order by id, subid nulls last;

演示：https://dbfiddle.uk/?rdbms=oracle_18&fiddle=e74ece8cb4571d7998014f8c55bd8d7a

Answer 2

with src as (
select n.id,n.country,l.color, 
(select count(id)-1 
from countries where id=n.id)  total_countries
,(
select count(id)-1
from colors where id=l.id
) total_colors
from countries  n
inner join colors  l
on n.id = l.id
)
select 
id, 
country, 
lag(color, total_countries) over (partition by id order by color) color 
from 
src 
where total_countries > 0
union all
select 
id, 
lag(country, total_colors) over (partition by id order by country) country
,color
from 
src 
where total_colors > 0
order by id, country nulls last, color nulls last

fiddle

Oracle-SQL 加入重复的列但避免重复的行

Oracle-SQL Join on Duplicate columns but avoid Duplicate rows

sql

oracle

join

oracle11g