IF ((SELECT COUNT(*) FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS WHERE CONSTRAINT_NAME = 'FK_ROIPeriodChannels_ChannelId') = 0)
	ALTER TABLE [dbo].[ROIPeriodChannels]  WITH NOCHECK ADD  CONSTRAINT [FK_ROIPeriodChannels_ChannelId] FOREIGN KEY([ChannelId])
	REFERENCES [dbo].[Channels] ([Id])