tsql – T-SQL.如何检索具有2个日期范围的行,该行将与两个日期列进行比较.

2019年8月3日 169次阅读

以下是给定的表格数据：

CREATE TABLE #tbl_period (
    period_no INT,
    period_from SMALLDATETIME,
    period_to SMALLDATETIME
)

INSERT INTO #tbl_period (period_no, period_from, period_to)
VALUES (1, '2004-11-01 00:00:00', '2005-10-31 00:00:00')

INSERT INTO #tbl_period (period_no, period_from, period_to)
VALUES (2, '2005-11-01 00:00:00', '2006-10-31 00:00:00')

INSERT INTO #tbl_period (period_no, period_from, period_to)
VALUES (3, '2006-11-01 00:00:00', '2007-10-31 00:00:00')

INSERT INTO #tbl_period (period_no, period_from, period_to)
VALUES (4, '2007-11-01 00:00:00', '2008-10-31 00:00:00')

INSERT INTO #tbl_period (period_no, period_from, period_to)
VALUES (5, '2008-11-01 00:00:00', '2009-10-31 00:00:00')

INSERT INTO #tbl_period (period_no, period_from, period_to)
VALUES (6, '2009-11-01 00:00:00', '2010-10-31 00:00:00')

INSERT INTO #tbl_period (period_no, period_from, period_to)
VALUES (7, '2010-11-01 00:00:00', '2011-10-31 00:00:00')

SELECT * FROM #tbl_period

DROP TABLE #tbl_period

现在,我们的目标是检索具有2个给定日期的period_no,这些日期将与period_from和period_to列进行比较.

Example1:
date1 = '2010-11-01 00:00:00'
date2 = '2011-10-31 00:00:00'

这将返回7作为period_no

Example2: 
date1 = '2005-11-01 00:00:00'
date2 = '2007-10-31 00:00:00'

它不应返回period_no,因为给定的日期范围不在行的period_from和period_to列的范围内.不允许重叠日期.

如果2给定日期将匹配或者在行中的period_from和period_to列的范围内,则规则是检索period_no.

如何在T-SQL中执行此查询？

提前致谢！

最佳答案 我认为这就是你所追求的：

SELECT 
    *
FROM 
    #tbl_period 
WHERE 
    @date1 >= period_from 
    and
    @date2 <= period_to

测试：

declare @date1 datetime = '2010-11-01 00:00:00' 
declare @date2 datetime = '2011-10-31 00:00:00' 

SELECT * FROM #tbl_period WHERE @date1 >= period_from and @date2 <= period_to

回报

period_no    period_from          period_to
7            2010-11-01 00:00:00  2011-10-31 00:00:00

和

set @date1 = '2005-11-01 00:00:00' 
set @date2 = '2007-10-31 00:00:00' 

SELECT * FROM #tbl_period WHERE @date1 >= period_from and @date2 <= period_to

回报

period_no   period_from period_to
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