如何查找SQL Server存储过程中日期范围列表中是否存在给定日期范围？

Question

我必须编写一个存储过程来查找给定的日期范围是重叠表中的日期范围列表。

例）

数据库：SQL Server 2008 R2的

SP Input: 2012-12-17 18:30:00.000  2012-12-19 18:29:59.000 

SP Output(Out parameter): True/False 

的预订表样本数据：

FromDate     ToDate 

2012-12-11 18:30:00.000  2012-12-12 18:29:59.000 
2012-12-12 18:30:00.000  2012-12-13 18:29:59.000 
2012-12-10 18:30:00.000  2012-12-11 18:29:59.000 
2012-12-18 18:30:00.000  2012-12-19 18:29:59.000 
2012-12-23 18:30:00.000  2012-12-28 18:29:59.000 
2012-12-17 18:30:00.000  2012-12-18 18:29:59.000 
2012-12-19 18:30:00.000  2012-12-22 18:29:59.000 
2012-12-16 18:30:00.000  2012-12-17 18:29:59.000 
2012-12-13 18:30:00.000  2012-12-14 18:29:59.000 
2012-12-11 23:00:00.000  2012-12-12 22:59:59.000 

存储过程：

USE [BookingDB] 
GO 
SET ANSI_NULLS ON 
GO 
SET QUOTED_IDENTIFIER ON 
GO 
ALTER PROCEDURE [dbo].[FindConflict]  
    @FromDate datetime, 
    @ToDate datetime, 
    @IsConflict bit OUT 
AS 

BEGIN 

?????????????????????(what to write here) 

END 

SQL：

USE [BookingDB] 
GO 
SET ANSI_NULLS ON 
GO 
SET QUOTED_IDENTIFIER ON 
GO 
CREATE TABLE [dbo].[BookingAdmin](
    [PK_BookingAdmin] [int] IDENTITY(1000,1) NOT NULL, 
    [FromDate] [datetime] NOT NULL, 
    [ToDate] [datetime] NOT NULL, 
CONSTRAINT [PK_BookingAdmin] PRIMARY KEY CLUSTERED 
(
    [PK_BookingAdmin] ASC 
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 
) ON [PRIMARY] 
GO 
SET IDENTITY_INSERT [dbo].[BookingAdmin] ON 
INSERT [dbo].[BookingAdmin] ([PK_BookingAdmin], [FromDate], [ToDate]) VALUES (1048, CAST(0x0000A1240130DEE0 AS DateTime), CAST(0x0000A1250130DDB4 AS DateTime)) 
INSERT [dbo].[BookingAdmin] ([PK_BookingAdmin], [FromDate], [ToDate]) VALUES (1049, CAST(0x0000A1250130DEE0 AS DateTime), CAST(0x0000A1260130DDB4 AS DateTime)) 
INSERT [dbo].[BookingAdmin] ([PK_BookingAdmin], [FromDate], [ToDate]) VALUES (1050, CAST(0x0000A1230130DEE0 AS DateTime), CAST(0x0000A1240130DDB4 AS DateTime)) 
INSERT [dbo].[BookingAdmin] ([PK_BookingAdmin], [FromDate], [ToDate]) VALUES (1051, CAST(0x0000A12B0130DEE0 AS DateTime), CAST(0x0000A12C0130DDB4 AS DateTime)) 
INSERT [dbo].[BookingAdmin] ([PK_BookingAdmin], [FromDate], [ToDate]) VALUES (1052, CAST(0x0000A1300130DEE0 AS DateTime), CAST(0x0000A1350130DDB4 AS DateTime)) 
INSERT [dbo].[BookingAdmin] ([PK_BookingAdmin], [FromDate], [ToDate]) VALUES (1053, CAST(0x0000A12A0130DEE0 AS DateTime), CAST(0x0000A12B0130DDB4 AS DateTime)) 
INSERT [dbo].[BookingAdmin] ([PK_BookingAdmin], [FromDate], [ToDate]) VALUES (1055, CAST(0x0000A12C0130DEE0 AS DateTime), CAST(0x0000A12F0130DDB4 AS DateTime)) 
INSERT [dbo].[BookingAdmin] ([PK_BookingAdmin], [FromDate], [ToDate]) VALUES (1056, CAST(0x0000A1290130DEE0 AS DateTime), CAST(0x0000A12A0130DDB4 AS DateTime)) 
INSERT [dbo].[BookingAdmin] ([PK_BookingAdmin], [FromDate], [ToDate]) VALUES (1057, CAST(0x0000A1260130DEE0 AS DateTime), CAST(0x0000A1270130DDB4 AS DateTime)) 
INSERT [dbo].[BookingAdmin] ([PK_BookingAdmin], [FromDate], [ToDate]) VALUES (1058, CAST(0x0000A124017B0740 AS DateTime), CAST(0x0000A125017B0614 AS DateTime)) 
GO 


CREATE PROCEDURE [dbo].[FindConflict]  
    @FromDate datetime, 
    @ToDate datetime, 
    @IsConflict bit OUT 
AS 
BEGIN 
    if exists (select * from BookingAdmin where FromDate = @ToDate and ToDate = @FromDate) 
     set @IsConflict = 1 
    else 
     set @IsConflict = 0   
END 

Answer 1

如果我理解正确的您的需求，您只需要检查是否有完全相同的范围表中，你可以试试这个

USE [BookingDB] 
GO 
SET ANSI_NULLS ON 
GO 
SET QUOTED_IDENTIFIER ON 
GO 
ALTER PROCEDURE [dbo].[FindConflict]  
    @FromDate datetime, 
    @ToDate datetime, 
    @IsConflict bit OUT 
AS 
BEGIN 
    if exists (select * from <your table> where FromDate = @FromDate and ToDate = @ToDate) 
     set @IsConflict = 1 
    else 
     set @IsConflict = 0 
END 

更新如果你想知道重叠范围，试试这个

... 
    if exists (select * from <your table> where FromDate <= @ToDate and ToDate >= @FromDate) 
     set @IsConflict = 1 
    else 
     set @IsConflict = 0 
... 

SQL FIDDLE EXAMPLE