Bigquery- Struct格式

Question

WITH yourTable AS (
      SELECT 1 AS id, '2013,1625,1297,7634' AS string_col UNION ALL
      SELECT 2, '1,2,3,4,5'
    )

    SELECT id, 
      (SELECT ARRAY_AGG(CAST(num AS INT64)) 
        FROM UNNEST(SPLIT(string_col)) AS num
      ) AS num,
      ARRAY(SELECT CAST(num AS INT64) 
        FROM UNNEST(SPLIT(string_col)) AS num
      ) AS num_2
    FROM yourTable

这就是我的实际表格的设计方式。现在我想将num * num_2相乘，然后将其总结。有没有办法把它变成结构格式，如ID，nums.num，nums.num_2，这样我就可以简单地乘以得到必要的结果。

PS：我在上面的select语句中寻找解决方案，但不在＃34;＆＃34;言。

Answer 1

好的，假设你真的有理由以你的方式拥有你的桌子（见我对你的问题的评论） - 下面应该有效

  

#standardSQL
SELECT id, 
  (
    SELECT SUM(num * num_2)
    FROM (SELECT pos, num FROM UNNEST(num) num WITH OFFSET pos) a
    JOIN (SELECT pos_2, num_2 FROM UNNEST(num_2) num_2 WITH OFFSET pos_2) b
    ON a.pos = b.pos_2
  ) mul
FROM yourTable   

您可以使用下面的

进行测试

#standardSQL
WITH yourTable AS (
  SELECT 1 id, [2013,1625,1297,7634] num, [2013,1625,1297,7634] num_2 UNION ALL
  SELECT 2, [1,2,3,4,5], [1,2,3,4,5] 
) 
SELECT id, 
  (
    SELECT SUM(num * num_2)
    FROM (SELECT pos, num FROM UNNEST(num) num WITH OFFSET pos) a
    JOIN (SELECT pos_2, num_2 FROM UNNEST(num_2) num_2 WITH OFFSET pos_2) b
    ON a.pos = b.pos_2
  ) mul
FROM yourTable