Bigquery - 合并具有一个公共值的数组

Question

我找不到合并两个具有共同值的数组的方法。我要创建的是一个数组，用作近期不需要的客户属性的各种存档。

我创建了一个数据库 fiddle 作为我正在使用的数据的示例。 https://www.db-fiddle.com/f/gKGsBFSgzZkTv3bMNhU9UG/1

前两个结果是两个单独的表，第三个结果是我希望通过将这两个数组合并在一起得到的。

我能想到的唯一方法可能是取消嵌套两个表，连接在一起然后重新制作数组，但我希望有一个 cleaner/more 有效的方法，因为我正在处理大量数据。

有什么建议吗？

Answer 1

尝试以下操作：

with test as (
    select 'user 1' as user, ['attribute 1', 'attribute 2', 'attribute 3'] as attributes union all
    select 'user 2' as user, ['attribute 1', 'attribute 2', 'attribute 3'] as attributes 
),
test_2 as (
    select 'user 1' as user, ['attribute 4', 'attribute 5', 'attribute 6'] as attributes union all
    select 'user 2' as user, ['attribute 7', 'attribute 8', 'attribute 9'] as attributes 
)

select t.user
    , array_concat(t.attributes,t2.attributes)
from test t
join test_2 t2
 on t.user=t2.user

array_concat 函数将为每个匹配的用户列将两列连接在一起。使用示例数据生成以下内容：

Answer 2

您可以使用 ARRAY_CONCAT to meet your requirement since it will merge two arrays and you can provide the condition in the WHERE 子句。

with test as (
   select 'user 1' as user, ['attribute 1', 'attribute 2', 'attribute 3'] as attributes union all

   select 'user 2' as user, ['attribute 1', 'attribute 2', 'attribute 3'] as attributes
),
test_2 as (
   select 'user 1' as user, ['attribute 4', 'attribute 5', 'attribute 6'] as attributes union all

   select 'user 2' as user, ['attribute 7', 'attribute 8', 'attribute 9'] as attributes
)
select t.user,array_concat(t.attributes,t_2.attributes) as attributes
from test as t,test_2 as t_2 
where t.user=t_2.user

输出Table

Bigquery - 合并具有一个公共值的数组

Bigquery - Merging Arrays With One Common Value

arrays

google-bigquery