SqlServer 相邻数据(时间上相邻) 相邻状态 数据合并

原始数据

检索目标

实践过程

-- 如果有临时表就删除该临时表
IF EXISTS(SELECT * FROM dbo.sysobjects WHERE id = OBJECT_ID(N'#T') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
BEGIN
DROP TABLE #T
END

-- 创建临时表
CREATE TABLE #T(
T_NO int,
T_Status varchar(30),
TTime datetime,
);

-- 测试数据
INSERT INTO #T
SELECT 1,'开','2014-03-18 00:00:00' UNION ALL
SELECT 1,'关','2014-03-18 10:00:00' UNION ALL
SELECT 1,'关','2014-03-18 13:00:00' UNION ALL
SELECT 1,'开','2014-03-18 16:00:00' UNION ALL
SELECT 2,'开','2014-03-18 00:00:00' UNION ALL
SELECT 2,'开','2014-03-18 13:00:00' UNION ALL
SELECT 2,'关', '2014-03-18 16:00:00';

SELECT * FROM #T

-- 检索过程
DECLARE @SqlString varchar(max);
SET @SqlString = 'select ROW_NUMBER() over(order by T_NO,TTime) as RowID,T_NO,T_status,TTime from #T';

EXEC(@SqlString);

SET @SqlString = 'select '
+ ' t1.*, t2.TTime as TEndTime'
+ ' from (' + @SqlString + ') t1 '
+ ' left join (' + @SqlString +' ) t2 '
+ ' on t2.RowID = t1.RowID + 1 and t1.T_NO = t2.T_NO and t1.T_status = t2.T_status'
;

EXEC(@SqlString);

SET @SqlString = 'select '
+ ' T_NO,T_status,TTime '
+ ' from (' + @SqlString + ') t1 '
+ ' where TEndTime is null'
EXEC(@SqlString);