Insert into where no exist

INSERT INTO dbo.miscDemographics_Relation(miscDemographics_Id,miscDemographics_MasterId,miscDemographics_CreatedDate) SELECT i.miscDemographics_ID,i.miscDemographics_MasterId,GETDATE() FROM inserted i –END WHERE NOT EXISTS (SELECT * FROM dbo.miscDemographics_Relation mrl WHERE i.miscDemographics_ID=mrl.miscDemographics_ID AND ISNULL(i.miscDemographics_MasterId,0)=ISNULL(mrl.miscDemographics_MasterId,0))

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