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[数据库]计算下条记录与上条记录日期天数之差


USE [test]GO/****** Object: Table [dbo].[liu_shui]  Script Date: 11/13/2015 09:34:50 ******/SET ANSI_NULLS ONGOSET QUOTED_IDENTIFIER ONGOCREATE TABLE [dbo].[liu_shui](  [d_date] [date] NOT NULL,  [i_id] [int] IDENTITY(1,1) NOT NULL, CONSTRAINT [PK_liu_shui] PRIMARY KEY CLUSTERED (  [i_id] ASC)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]GOSET IDENTITY_INSERT [dbo].[liu_shui] ONINSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xA73A0B00 AS Date), 1)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xA83A0B00 AS Date), 2)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xA93A0B00 AS Date), 3)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xAA3A0B00 AS Date), 4)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xAB3A0B00 AS Date), 5)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xAD3A0B00 AS Date), 6)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xAF3A0B00 AS Date), 8)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xB03A0B00 AS Date), 9)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xB23A0B00 AS Date), 11)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xB33A0B00 AS Date), 12)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xB53A0B00 AS Date), 13)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xB83A0B00 AS Date), 14)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xB93A0B00 AS Date), 15)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xBA3A0B00 AS Date), 16)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xBB3A0B00 AS Date), 17)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xBC3A0B00 AS Date), 18)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xBD3A0B00 AS Date), 19)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xBE3A0B00 AS Date), 20)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xBF3A0B00 AS Date), 21)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xC03A0B00 AS Date), 22)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xC13A0B00 AS Date), 23)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xC23A0B00 AS Date), 24)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xC33A0B00 AS Date), 25)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xC43A0B00 AS Date), 26)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xC53A0B00 AS Date), 27)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xC63A0B00 AS Date), 28)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xC73A0B00 AS Date), 29)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xC83A0B00 AS Date), 30)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xC93A0B00 AS Date), 31)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xCB3A0B00 AS Date), 32)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xCC3A0B00 AS Date), 33)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xCD3A0B00 AS Date), 34)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xCE3A0B00 AS Date), 35)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xCF3A0B00 AS Date), 36)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xD03A0B00 AS Date), 37)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xD13A0B00 AS Date), 38)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xD33A0B00 AS Date), 39)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xD63A0B00 AS Date), 40)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xD73A0B00 AS Date), 41)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xD83A0B00 AS Date), 42)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xD93A0B00 AS Date), 43)INSERT [dbo].[liu_shui] ([d_date], [i_id]) VALUES (CAST(0xDA3A0B00 AS Date), 44)SET IDENTITY_INSERT [dbo].[liu_shui] OFFgo/******计算日期差,方法1 ******/SELECT    a.[i_id]   ,a.[d_date]   ,日期差=    COALESCE(DATEDIFF(DAY,b.d_date,a.d_date),0) FROM [test].[dbo].[liu_shui] as a outer apply (select b.d_date from test.dbo.liu_shui b  where a.i_id-b.i_id=1) as b go /*计算日期差,方法2*/ SELECT    a.[i_id]   ,a.[d_date]   ,日期差=    coalesce(         (         select DATEDIFF(DAY,b.d_date,a.d_date) from test.dbo.liu_shui b         where a.i_id-b.i_id =1         ),0        ) FROM [test].[dbo].[liu_shui] as a