大查询中列的结构值

Question

I have a column "device" which have struct values in every row

device

(row 1)

brand_name	brand_id	country
huawei	34j0	china

(row 2)

brand_name	brand_id	country
sony	ds5g	japan

we can create column from these structs by doing this

SELECT
device.brand_name 
device.brand_id 
device.country 
from table

In this case struct only have three values ( brand_name,brand_id, country) but what if the struct have n number of values, so what i want to do is instead of accessing every value in struct by devicedevice.brand_name,device.brand_id....etc, I want to loop all the values inside it and make it as a column, is there a way to do it? , thank you

Answer 1

You can just use the wildcard symbol * . More specifically:

WITH devices as (
SELECT STRUCT("sony" as brand_name, "ds5g" as brand_id, "japan" as country) as device UNION ALL
SELECT STRUCT("huawei" as brand_name, "34j0" as brand_id, "china" as country) as device
)

SELECT device.* FROM devices