时间差函数使用
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IF OBJECT_ID('[dbo].[get_service_status]') IS NOT NULL DROP FUNCTION [dbo].[get_service_status]GOCREATE FUNCTION [dbo].[get_service_status]( @arrear_time datetime, @reminder_time int, (单位：天) @buffer_time int (单位：天))RETURNS nvarchar(10)ASBEGIN DECLARE @service_status nvarchar(10) SET @service_status = '状态1' -- 当前时间 DECLARE @current_time datetime --SET @current_time = getdate() -- sqlserver2000中不能这样调用 SELECT @current_time = Today FROM [dbo].[view_get_date] -- 时间差 DECLARE @nDiffDay int SELECT @nDiffDay = datediff(dd, @current_time, @arrear_time) IF (@nDiffDay > @reminder_time) BEGIN SET @service_status = '状态1' END ELSE IF (@nDiffDay <= @reminder_time AND @nDiffDay >= 0) BEGIN SET @service_status = '状态2' END ELSE IF (@nDiffDay < 0 AND @nDiffDay >= -@buffer_time) BEGIN SET @service_status = '状态3' END ELSE BEGIN SET @service_status = '状态4' END RETURN @service_statusENDGO
