我有这样的数据：
id col1 col2
-----------------
1 [1,2] [2,3]
2 [4,4,6] [6,7]
我想要这样的数据：
id col3
---------
1 [2]
2 [6]
有什么聪明的解决方案吗？
您可以使用INTERSECT DISTINCT
-- build example table
WITH example as (
SELECT
* FROM UNNEST([
STRUCT([1,2] as col1, [2,3] as col2),
STRUCT([4,4,6],[6,7])
])
)
-- INTERSECT per row on two arrays
SELECT
ARRAY(SELECT * FROM example.col1
INTERSECT DISTINCT
(SELECT * FROM example.col2)
) AS result
FROM example
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