Sql 嗯，请给我一个正确的解释。不要只是说有问题。这是你的问题。比较结果。它们不匹配。@MostyMostacho感谢您显示错误。我错过了在select查询中再次看到角色_1。我已经修改它，以适应用户的需要。 Sr No | TIMESTAMP

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嗯，请给我一个正确的解释。不要只是说有问题。这是你的问题。比较结果。它们不匹配。@MostyMostacho感谢您显示错误。我错过了在select查询中再次看到角色_1。我已经修改它，以适应用户的需要。

Sr No | TIMESTAMP                         |  RoleInstance   | Id  
1     | 2012-03-14 12:00:00.000           | SLBMRole_IN_1   | 120007  
2     | 2012-03-14 12:01:00.000           | SLBMRole_IN_1   | 120007  
3     | 2012-03-14 12:02:00.000           | SLBMRole_IN_1   | 120007  
4     | 2012-03-14 12:24:00.000           | SLBMRole_IN_0   | 120007  
5     | 2012-03-14 12:25:00.000           | SLBMRole_IN_0   | 120007  
5     | 2012-03-14 12:26:00.000           | SLBMRole_IN_0   | 120007  
6     | 2012-03-14 12:27:00.000           | SLBMRole_IN_1   | 120007  
7     | 2012-03-14 12:28:00.000           | SLBMRole_IN_1   | 120007  

RoleInstance  | Start time                |  End Time  
SLBMRole_IN_1 |     1st row Time stamp    |  3rd row time stamp(bcz 4th row RoleInstance changed)   
SLBMRole_IN_0 |     4th row time stamp    |   5th row time stamp  
SLBMRole_IN_1 |     6th row time stamp    |   …so on and so forth  

select *,rn = row_number() over (order by timestamp,roleinstance)
into    #temp2
from #temp1

select  a.*
from    #temp2 a
where   rn = 1
union all
select  a.*
from    #temp2 a, #temp2 b
where   a.rn+1 = b.rn
and     a.roleinstance <> b.roleinstance
union all
select  a.*
from    #temp2 a, #temp2 b
where   a.rn = b.rn +1
and     a.roleinstance <> b.roleinstance
order by a.rn

CREATE TABLE #temp (SrNo INT,  DTS DATETIME, RoleInstance VARCHAR(30), Id INT)
INSERT INTO #temp VALUES
    (1,'2012-03-14 12:00:00.000','SLBMRole_IN_1',120007),
    (2,'2012-03-14 12:01:00.000','SLBMRole_IN_1',120007), 
    (3,'2012-03-14 12:02:00.000','SLBMRole_IN_1',120007),
    (4,'2012-03-14 12:24:00.000','SLBMRole_IN_0',120007),
    (5,'2012-03-14 12:25:00.000','SLBMRole_IN_0',120007),
    (6,'2012-03-14 12:26:00.000','SLBMRole_IN_0',120007),
    (7,'2012-03-14 12:27:00.000','SLBMRole_IN_1',120007),
    (8,'2012-03-14 12:28:00.000','SLBMRole_IN_1',120007)

WITH Logins AS (
    SELECT t2.SrNo, ROW_NUMBER() OVER (ORDER BY t2.SrNo) AS join_no, t2.RoleInstance, t2.DTS, t2.Id
    FROM #temp t2 LEFT JOIN #temp t1 ON t2.SrNo = t1.SrNo +1
    WHERE t1.RoleInstance <> t2.RoleInstance OR t1.RoleInstance IS NULL),
Logouts AS (
    SELECT t1.SrNo, ROW_NUMBER() OVER (ORDER BY t1.SrNo) AS join_no, t1.RoleInstance, t1.DTS, t1.Id
    FROM #temp t1 LEFT JOIN #temp t2 ON t2.SrNo = t1.SrNo +1
    WHERE t1.RoleInstance <> t2.RoleInstance OR t2.RoleInstance IS NULL)
SELECT i.Id, i.RoleInstance, i.SrNo AS InSrNo, i.DTS AS InDTS, o.SrNo AS OutSrNo, o.DTS AS OutDTS
FROM Logins i INNER JOIN Logouts o ON i.join_no = o.join_no