SQL行列转换

以三个站点三个参数为例

1、以参数当列时   

select zad_time,zad_sid,zad_data1,zad_data2,zad_data3,zad_data4    from [XHAQMMS_CDB].[dbo].[XHZ_T_DAYREP_AQI_XZ]    where zad_sid in(000000,000001,000002) and zad_time='20130416'

2、以参数当行时   

select * from ( select zad_time,zad_sid,参数='SO2', 浓度值 = zad_data1 from [XHAQMMS_CDB].[dbo].[XHZ_T_DAYREP_AQI_XZ] where zad_time='20130416' and zad_sid in('000000','000001','000002') union all select zad_time,zad_sid,参数='NO2', 浓度值 = zad_data2 from [XHAQMMS_CDB].[dbo].[XHZ_T_DAYREP_AQI_XZ] where zad_time='20130416' and zad_sid in('000000','000001','000002') union all select zad_time,zad_sid,参数='PM10', 浓度值 = zad_data3 from [XHAQMMS_CDB].[dbo].[XHZ_T_DAYREP_AQI_XZ] where zad_time='20130416' and zad_sid in('000000','000001','000002') ) t order by zad_time

 

    以站点当列时

select zad_time,参数,供销商城,ssss,dddd  from ( select zad_time,参数='SO2',sum(case zad_sid when '000000' then zad_data1 end)  as '供销商城',sum(case zad_sid when '000001' then zad_data1 end)  as 'ssss', sum(case zad_sid when '000002' then zad_data1 end)  as 'dddd' from [XHAQMMS_CDB].[dbo].[XHZ_T_DAYREP_AQI_XZ] where zad_time='20130416' group by zad_time union all select zad_time,参数='NO2',sum(case zad_sid when '000000' then zad_data2 end)  as '供销商城',sum(case zad_sid when '000001' then zad_data2 end)  as 'ssss', sum(case zad_sid when '000002' then zad_data2 end)  as 'dddd' from [XHAQMMS_CDB].[dbo].[XHZ_T_DAYREP_AQI_XZ] where zad_time='20130416' group by zad_time union all select zad_time,参数='PM10',sum(case zad_sid when '000000' then zad_data3 end)  as '供销商城',sum(case zad_sid when '000001' then zad_data3 end)  as 'ssss', sum(case zad_sid when '000002' then zad_data3 end)  as 'dddd' from [XHAQMMS_CDB].[dbo].[XHZ_T_DAYREP_AQI_XZ] where zad_time='20130416' group by zad_time ) t order by zad_time