Update From sample
// sample "update from" sql statement
UPDATE [Crm].[tbPartyLegalEntityData] SET [CompanyType] = ape.[CompanyType], [EmployeesCount] = ape.[EmployeesCount] FROM [Crm].[tbPartyLegalEntityData] p INNER JOIN App.[tbApplicationPersonEmployer] AS ape ON ape.[Bulstat] = p.[Bulstat] WHERE ape.[Bulstat] <> '!' AND [ape].[EmployeesCount] IS NOT NULL AND [ape].[CompanyType] IS NOT NULL