if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[Td_OverUnder]') and OBJECTPROPERTY(id, N'IsTrigger') = 1)
drop trigger [dbo].[Td_OverUnder]


if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[TI_OverUnder]') and OBJECTPROPERTY(id, N'IsTrigger') = 1)
drop trigger [dbo].[TI_OverUnder]


if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[TU_OverUnder]') and OBJECTPROPERTY(id, N'IsTrigger') = 1)
drop trigger [dbo].[TU_OverUnder]