troubleshooting Question

MS SQL -Update from another table - what is the fastes method?

Avatar of n2dweb
n2dwebFlag for United States of America asked on
Microsoft SQL ServerMicrosoft SQL Server 2005
7 Comments1 Solution536 ViewsLast Modified:
I have 4 fields in 2 different tables that have to be updated regularly from a 3rd table
Below is what I am currently doing, but it is very slow.

--update PRDs
UPDATE dbo.PRDs SET RN = PVN.RN FROM
   (SELECT RN, VN FROM dbo.PV WHERE RN = @RN) AS PVN
    WHERE dbo.PRDs.VN = PVN.VN
UPDATE dbo.PRDs SET EmpKey = PVN.EK FROM
   (SELECT EK, VN FROM dbo.PV WHERE RN = @RN) AS PVN
    WHERE dbo.PRDs.VN = PVN.VN
UPDATE dbo.PRDs SET VCID = PVN.VN FROM
   (SELECT  VN FROM dbo.PV WHERE RN = @RN) AS PVN
    WHERE dbo.PRDs.VN = PVN.VN
UPDATE dbo.PRDs SET vNum = PVN.vNum FROM
   (SELECT vNum, VN FROM dbo.PV WHERE RN = @RN) AS PVN
    WHERE dbo.PRDs.VN = PVN.VN

--update PRTs
UPDATE dbo.PRTs SET RN = PVN.RN FROM
   (SELECT RN, VN FROM dbo.PV WHERE RN = @RN) AS PVN
    WHERE dbo.PRTs.VN = PVN.VN
UPDATE dbo.PRTs SET EmpKey = PVN.EK FROM
   (SELECT EK, VN FROM dbo.PV WHERE RN = @RN) AS PVN
    WHERE dbo.PRTs.VN = PVN.VN
UPDATE dbo.PRTs SET VCID = PVN.VN FROM
   (SELECT  VN FROM dbo.PV WHERE RN = @RN) AS PVN
    WHERE dbo.PRTs.VN = PVN.VN
UPDATE dbo.PRTs SET vNum = PVN.vNum FROM
   (SELECT vNum, VN FROM dbo.PV WHERE RN = @RN) AS PVN
    WHERE dbo.PRTs.VN = PVN.VN

Is there a faster way to preform this update?
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