我的项目是在网格中显示传感器状态，需要sql查询以显示我在下面提到的几种情况下的传感器状态

问题描述

我的项目是在网格中显示传感器状态，每个传感器状态有3种状态1)OFF 2)LOAD 3)IDLE.这种情况完全基于电压，因此如果传感器为LOAD生成10个报告并且第11个报告为OFF，那么我只需要在grid中显示LOAD的第一个报告和OFF的第一个报告.所以我需要此任务的sql查询. br/>
预先谢谢您.

my project is to display the sensor status in grid,each sensor state has 3 states 1)OFF 2) LOAD 3)IDLE. This conditions is purely based on voltages so if a sensor generated 10 reports for LOAD and the 11th report is OFF so i need to display only 1st report of LOAD and 1st report of OFF in grid.so i need sql query for this task.

thank you in advance

推荐答案

IF OBJECT_ID(N'tempdb..#s1') IS NOT NULL
  drop table #s1

select ROW_NUMBER() over (partition by '1' order by imeino, sensor ,timestamp) rid, *  into #s1 from
(
select autoid, imeino , deviceid , timestamp, 's-1' sensor, [s-1] status   from sensordata
union
select autoid, imeino , deviceid , timestamp, 's-2' sensor, [s-2] status   from sensordata
union
select autoid, imeino , deviceid , timestamp, 's-3' sensor, [s-3] status   from sensordata
union
select autoid, imeino , deviceid , timestamp, 's-4' sensor, [s-4] status   from sensordata
) as flatted
 where not imeino is null

;with a(rid, autoid, imeino, deviceid, timestamp, sensor, status, r) as
(
select * , RANK() over (partition by imeino, sensor, status order by rid) r from #s1
)
select * from a
where r = 1

我以为您的表名称是sensordata，因此请将其更改为任何名称.

如果您不能将其转换为存储过程，那么就不应该得到一个好成绩...

希望对您有所帮助.

I assumed that your table name is sensordata so change it to whatever it is.

If you can''t convert it to stored procedure so you do not deserve to get a good score...

Hope it helps.

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