如何在 BigQuery 中聲明列表/數組/結構類型變量

Question

如何在 BigQuery 中聲明列表類型變量，以便我可以在 where 子句中使用它？ 我有這個代碼

WITH
  subquery AS (
  SELECT
    1 AS col1
  UNION ALL
  SELECT
    2 AS col1
  UNION ALL
  SELECT
    3 AS col1 )

SELECT
  col1
FROM
  subquery
WHERE
  col1 IN (1, 2)

相反，我想在查詢中使用變量

DECLARE list ARRAY;
SET list = (1,2);

WITH
  subquery AS (
  SELECT
    1 AS col1
  UNION ALL
  SELECT
    2 AS col1
  UNION ALL
  SELECT
    3 AS col1 )

SELECT
  col1
FROM
  subquery
WHERE
  col1 IN list

我試過 DECLARE list STRUCT [less than] int64,int64 [greater than] 它不接受

Answer 1

試試下面的代碼：

DECLARE list ARRAY <INT64>;
SET list = [1,2];

WITH
  subquery AS (
  SELECT
    1 AS col1
  UNION ALL
  SELECT
    2 AS col1
  UNION ALL
  SELECT
    3 AS col1 )

SELECT
  col1
FROM
  subquery
WHERE
  col1 IN UNNEST(list)

Answer 2

如果您真的想將 DECLARE 與 STRUCT 類型一起使用，或者對於找到這篇文章的其他人，以下語法似乎也有效：

聲明 foo 默認（選擇為結構 2、2、2、2）；