如何根据 BQ 中的嵌套字段值更新顶级列

Question

我正在尝试使用下面的 case 语句基于嵌套列值更新顶级列

UPDATE
  `project.database.table`
SET
  ReplaceTotal= (
  SELECT
    CASE
      WHEN DamageLineInfo.MessageCode='MO' AND DamageLineInfo.AutomatedEntry=TRUE AND DamageLineInfo.LaborInfo.LaborOperation='OPO' AND DamageLineInfo.LaborInfo.LaborType='LAB' AND DamageLineInfo.LaborInfo.LaborInclInd=FALSE THEN DamageLineInfo.LaborInfo.LaborAmt
      WHEN DamageLineInfo.LaborInfo.LaborOperation='OP9'
    OR DamageLineInfo.LaborInfo.LaborOperation='OP11'
    OR DamageLineInfo.LaborInfo.LaborOperation='OP5'
    OR DamageLineInfo.LaborInfo.LaborOperation='OP12'
    OR DamageLineInfo.LaborInfo.LaborOperation='OP10'
    OR DamageLineInfo.LaborInfo.LaborOperation='OP1'
    OR DamageLineInfo.LaborInfo.LaborOperation='OP21' THEN
    CASE
      WHEN DamageLineInfo.LaborInfo.LaborType='LAB' AND DamageLineInfo.LaborInfo.LaborInclInd=FALSE THEN DamageLineInfo.LaborInfo.LaborAmt
  END
  END as ReplaceTotal
  FROM
    UNNEST(ServiceBusEnvelope.Payload.RepairOrderFolderAddRq.DamageLineInfo) AS DamageLineInfo)
WHERE
  TRUE

当我运行查询时出现以下错误标量子查询产生了一个以上的元素

帮助我理解错误。如果错误是因为生成的数据有值列表，那么请我获取数据的第一个值。

Answer 1

If the error is because the data generated is having list of values

是的，就是这个原因

get the first value of the data

只需添加 LIMIT 1，如下例所示

UPDATE
  `project.database.table`
SET
  ReplaceTotal= (
  SELECT
    CASE
      WHEN DamageLineInfo.MessageCode='MO' AND DamageLineInfo.AutomatedEntry=TRUE AND DamageLineInfo.LaborInfo.LaborOperation='OPO' AND DamageLineInfo.LaborInfo.LaborType='LAB' AND DamageLineInfo.LaborInfo.LaborInclInd=FALSE THEN DamageLineInfo.LaborInfo.LaborAmt
      WHEN DamageLineInfo.LaborInfo.LaborOperation='OP9'
    OR DamageLineInfo.LaborInfo.LaborOperation='OP11'
    OR DamageLineInfo.LaborInfo.LaborOperation='OP5'
    OR DamageLineInfo.LaborInfo.LaborOperation='OP12'
    OR DamageLineInfo.LaborInfo.LaborOperation='OP10'
    OR DamageLineInfo.LaborInfo.LaborOperation='OP1'
    OR DamageLineInfo.LaborInfo.LaborOperation='OP21' THEN
    CASE
      WHEN DamageLineInfo.LaborInfo.LaborType='LAB' AND DamageLineInfo.LaborInfo.LaborInclInd=FALSE THEN DamageLineInfo.LaborInfo.LaborAmt
  END
  END as ReplaceTotal
  FROM
    UNNEST(ServiceBusEnvelope.Payload.RepairOrderFolderAddRq.DamageLineInfo) AS DamageLineInfo
  LIMIT 1
  )
WHERE
  TRUE

如何根据 BQ 中的嵌套字段值更新顶级列

How to update a top level column based on nested field value in BQ

google-bigquery

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