如何在teradata中迁移sql更新查询?
我想在teradata中迁移下面的查询。我正在更新表中的一些行,并用sql编写了此查询。现在,我想在teradata中迁移下面的脚本。我听说我们需要使用volatile表来选择数据,然后进行更新。我必须先创建一个volatile表,然后再进行更新吗如何在teradata中迁移sql更新查询?,sql,oracle,teradata,Sql,Oracle,Teradata,我想在teradata中迁移下面的查询。我正在更新表中的一些行,并用sql编写了此查询。现在,我想在teradata中迁移下面的脚本。我听说我们需要使用volatile表来选择数据,然后进行更新。我必须先创建一个volatile表,然后再进行更新吗 UPDATE gam SET gam.DeviceActiveInSIGMA = 1, gam.DeviceInSIGMA =1, gam.AccountServiceInSIGMA =1, gam.AccountI
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')
您不需要使用Volatile表,而需要使用派生表,因为Teradata不支持更新中的外部联接 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 Server编写的,而不是为Oracle编写的。您是否正在尝试将上述查询从其他数据库迁移到Teradata?如果是,该查询是为哪个数据库编写的?该查询是为oracle db编写的。现在迁移到teradata。