将行转置为列以获得相同的ID

Question

我有一张叫做设备的桌子。

  

Unit_ID SensorSerial
1   11
1   22
  1 33   
2   44
2    55
2   66
3   77
3   88
3   99

我想查询下面的表格：

  

Unit_ID Sensor1 Sensor2   传感器3
1   11   22   33
2   44   55   66
3   77   88   99

Answer 1

你可以试试这个

select Unit_ID,
       max(case when seqnum = 1 then SensorSerial end) as Sensor1,
       max(case when seqnum = 2 then SensorSerial end) as Sensor2,
       max(case when seqnum = 3 then SensorSerial end) as Sensor3       
from (select equipment.*, 
             row_number() over (partition by Unit_ID order by SensorSerial) as seqnum
      from equipment
     ) equipment
group by Unit_ID;