SSRS 2008 - 根据多个标准返回下一个可用记录

Question

给定临时表#RawAlarms中的以下数据集：

我需要返回每个AlarmState =＆＃39; UNACK_ALM＆＃39;的第一个实例，内联下一个AlarmState的实例＆＃39; ACK_ALM＆＃39; OR＆＃39; ACK_RTN＆＃39;但不是两个。

我正在运行的查询如下：

SELECT RA1.TagName, RA1.DateTime, RA1.Description, RA2.Description, MIN(RA2.DateTime) as AckDT
FROM #RawAlarms RA1
INNER JOIN #RawAlarms RA2 ON RA1.TagName = RA2.TagName AND RA2.DateTime > RA1.DateTime 
    AND RA1.LotStartDT = RA2.LotStartDT and RA1.LotEndDT = RA2.LotEndDT
WHERE RA1.AlarmState = 'UNACK_ALM' AND RA2.AlarmState IN('ACK_RTN','ACK_ALM')
GROUP BY RA1.TagName, RA1.DateTime, RA1.Description, RA2.Description
ORDER BY RA1.TagName, RA1.DateTime

这些是我得到的结果;以红色突出显示的是我需要的结果示例： 帮助

Answer 1

我认为APPLY operator可以在这里提供帮助：

SELECT RA1.TagName, RA1.DateTime, RA1.Description, NextAlarmState.Description, NextAlarmState.DateTime AS AckDT
FROM #RawAlarms RA1
    CROSS APPLY (SELECT TOP 1 RA2.Description, RA2.DateTime
                 FROM #RawAlarms RA2
                 WHERE RA2.LotStartDT = RA1.LotStartDT 
                     AND RA2.LotEndDT = RA1.LotEndDT
                     AND RA2.DateTime > RA1.DateTime
                     AND RA2.AlarmState IN ('ACK_RTN', 'ACK_ALM')
                 ORDER BY RA2.DateTime) AS NextAlarmState
WHERE RA1.AlarmState = 'UNACK_ALM'
ORDER BY RA1.TagName, RA1.DateTime