我有这个数据类型的值
array<struct<id:string,name:string,values:array<string>>
[{id=gid://test/1234,name=尺寸,values=[L、M、S、XS]},{id=gid://test/12345,name=颜色,values=[黑色]} ]
如何查询以获取像这样的输出的大小值 [L、M、S、XS]
我试过这个
SELECT
*
FROM
mytable
CROSS JOIN UNNEST(options) AS t (option_struct)
CROSS JOIN UNNEST(option_struct.values) AS size_value
WHERE
option_struct.name = 'Size'
如果目标是获取数组,则不需要使用第二个
unnest
:
-- sample data
with dataset(options) as(
values (array[
cast(ROW('gid://test/1234', 'Size', array['L', 'M', 'S', 'XS']) as ROW(id varchar, name varchar, "values" array(varchar))),
cast(ROW('gid://test/12345', 'Color', array['Black']) as ROW(id varchar, name varchar, "values" array(varchar)))
])
)
-- query
SELECT option_struct."values" as size_value
FROM
dataset
, UNNEST(options) AS option_struct
WHERE
option_struct.name = 'Size';