如何在 teradata 中迁移 sql 更新查询？

Question

我想在 teradata 中迁移以下查询。我正在更新 table 中的一些行，并在 sql 中编写了此查询。现在，我想在 teradata 中迁移下面的脚本。听说要用volatiletable把数据select再update。是否必须先创建一个 volatile table 然后更新？

UPDATE gam 
    SET gam.DeviceActiveInSIGMA = 1,
    gam.DeviceInSIGMA =1,
    gam.AccountServiceInSIGMA =1,
    gam.AccountInSIGMA =1,
    gam.PKG_TYPE = 'VOICE',
    gam.MACType = 'Voice'
  FROM Staging.AllAccountDevices gam
  WITH (INDEX (ix_MAC_UniqueID))
  INNER JOIN dbo.TBL_SIGMA_VOIP_EQUIPMENT dvc
     ON gam.MACAddr = dvc.MTA_MAC
  INNER JOIN dbo.TBL_SIGMA_SUB sac
  ON dvc.SUB_ID = sac.SUB_ID
  AND gam.AccountNumber = sac.Account_Number
  LEFT OUTER JOIN HSIRECON.DBO.NEXTGEN_ACTIVE_SPAS nas 
  ON SUBSTRING(gam.AccountNumber,1,6) = nas.ACCOUNT_START

  WHERE nas.ACCOUNT_START is NULL
  AND gam.DeviceActiveInSIGMA = 0
  AND dvc.STATUS IN ('active','change_in_progress')

Answer 1

您不需要使用 Volatile Table，而是派生的 Table，因为 Teradata 不支持更新中的外部连接。

与此类似：

UPDATE gam
FROM Staging.AllAccountDevices  AS gam,
 (
   SELECT *  FROM Staging.AllAccountDevices gam
   INNER JOIN dbo.TBL_SIGMA_VOIP_EQUIPMENT dvc
      ON gam.MACAddr = dvc.MTA_MAC
   INNER JOIN dbo.TBL_SIGMA_SUB sac
   ON dvc.SUB_ID = sac.SUB_ID
   AND gam.AccountNumber = sac.Account_Number
   LEFT OUTER JOIN HSIRECON.DBO.NEXTGEN_ACTIVE_SPAS nas 
   ON Substr(gam.AccountNumber,1,6) = nas.ACCOUNT_START
   WHERE nas.ACCOUNT_START IS NULL
   AND gam.DeviceActiveInSIGMA = 0
   AND dvc.STATUS IN ('active','change_in_progress')
 ) AS dt

SET DeviceActiveInSIGMA = 1,
    DeviceInSIGMA =1,
    AccountServiceInSIGMA =1,
    AccountInSIGMA =1,
    PKG_TYPE = 'VOICE',
    MACType = 'Voice'
WHERE gam.pk = dt.pk -- must be the Primary Key columns(s) of Staging.AllAccountDevices
  AND gam.DeviceActiveInSIGMA = 0

顺便说一句，原始查询是为 SQL 服务器而不是 Oracle 编写的。

如何在 teradata 中迁移 sql 更新查询？

how to migrate sql update query in teradata?

sql

oracle

teradata