各位大神，用这段代码写个触发器！

CREATE TABLE [dbo].[MIN_LATEST_IF](    [InstrumentID] [varchar](20) NOT NULL,    [TradingDay] [datetime] NOT NULL,    [TradingTime] [datetime] NOT NULL,    [Openprice] [float] NULL,    [Highprice] [float] NULL,    [Lowprice] [float] NULL,    [Closeprice] [float] NULL,    [Vol] [bigint] NULL,    [Opi] [bigint] NULL,    [settlementprice] [float] NULL,    [TotVol] [bigint] NULL, CONSTRAINT [PK__JYSJ_FZ___3CCC3C5636470DEF] PRIMARY KEY CLUSTERED (    [TradingDay] ASC,    [InstrumentID] ASC,    [TradingTime] ASC) WITH (PAD_INDEX =OFF,STATISTICS_NORECOMPUTE =OFF,IGNORE_DUP_KEY=OFF,ALLOW_ROW_LOCKS =ON,ALLOW_PAGE_LOCKS =ON) ON [PRIMARY] ) ON [PRIMARY]