update Hazard_HazardSelectedItem set HazardLevel=(select top 1 RiskLevelId from Base_RiskLevel where RiskLevel=1 ) where HazardLevel is null or HazardLevel='1' go update Hazard_HazardSelectedItem set HazardLevel=(select top 1 RiskLevelId from Base_RiskLevel where RiskLevel=2 ) where HazardLevel='2' go update Hazard_HazardSelectedItem set HazardLevel=(select top 1 RiskLevelId from Base_RiskLevel where RiskLevel=3 ) where HazardLevel='3' go update Hazard_HazardSelectedItem set HazardLevel=(select top 1 RiskLevelId from Base_RiskLevel where RiskLevel=4) where HazardLevel='4' go