Question

我正在尝试在BigQuery中使用DML更新嵌套的收入字段。挑战在于，我不想简单地替换收入的价值，而是将其乘以特定的因素。

仅用于替换，我发现：

UPDATE `project.dataset.table`
SET hits = ARRAY(
  SELECT AS STRUCT * REPLACE (
    (SELECT AS STRUCT transaction.* REPLACE ( 1 AS transactionRevenue)) AS transaction
  )
  FROM UNNEST(hits) as transactionRevenue
)
WHERE true

但是我想要类似的东西：

UPDATE `project.dataset.table`
SET hits = ARRAY(
  SELECT AS STRUCT * REPLACE (
    (SELECT AS STRUCT transaction.* REPLACE ( (transactionRevenue*5) AS transactionRevenue)) AS transaction
  )
  FROM UNNEST(hits) as transactionRevenue
)
WHERE true

这种方法行不通。错误消息：对于运算符*，对于参数类型：STRUCT，INT64没有匹配的签名。支持的签名：INT64 * INT64; FLOAT64 * FLOAT64; NUMERIC * NUMERIC at [4:48]

Answer 1

下面应该可以工作

UPDATE `project.dataset.table`
SET hits = ARRAY(
  SELECT AS STRUCT * REPLACE(
    (SELECT AS STRUCT * REPLACE(5 * transactionRevenue AS transactionRevenue) 
      FROM UNNEST([transaction])
    ) AS transaction
  ) 
  FROM t.hits
)
WHERE true

如何在BigQuery中更新（乘以5，而不是简单地替换）嵌套的收入字段？

1 个答案: