Question

Train_status_new表包含火车经过的车站代码的（4000+）详细信息。

Train_status_new

  RunId TrainNumber OriginStation_Name  PrevStation_Name    CurrentStation_Name     NextStation_Name    DestinationStation_Name
    1       6063            MS              VM                      NPM                 TDPR                NCJ
    1       6853            KIK             TMPT                    NCR                 NULL                NCR
    2       6027            TBM             VM                      ICG                 TPJ                 QLN
    2       12605           MS              GOC                     TPJ                 PDKT                KKDI
    3       12631           MS              TEN                     ICG                 TPJ                 TEN
    3       12654           TPJ             KKPM                    ALU                 PNDM                MS

Station_List具有（700+）个代码和站点名称。

Station_List

    StationCode     StationName
    TDPR            TIRUPADRIPULYUR
    KKDI            Karaikkudi
    PDKT            PUDUKKOTTAI
    ALU             Ariyalur
    MS              Chennai Egmore
    NCJ             Nagerkoil Junction
    PNDM            Pennadam
    QLN             Kollam Junction
    TBM             Tambaram
    TEN             Tirunelveli Junction
    TPJ             Tiruchirappalli Junction
    VM              Villupuram Junction
    KKPM            Kallakudi Plgh
    GOC             Golden Rock

现在，我想要Train_status_new中的站名代码名称。所以，我有这个查询，但是我有重复。

;with stationList as
(
 select StationId, StationCode code, StationName from Station_List st
)
, origin as
(
 select * from StationList st
 join train_Status_New tr
 on st.Code = tr.OriginStation_Name
)
, pre as
(
 select st.StationName, tr.RunId, tr.TrainNumber, tr.PrevStation_Name
 , tr.PrevStation_Act_Arr_Time, tr.PrevStation_Act_Dep_Time, tr.PrevStation_Sch_Arr_Time, tr.PrevStation_Sch_Dep_Time
 from StationList st
 join train_Status_New tr
 on st.Code = tr.PrevStation_Name
)
, cur as
(
 select st.StationName, tr.RunId, tr.TrainNumber, tr.CurrentStation_Name 
 , tr.CurrentStation_Act_Arr_Time, tr.CurrentStation_Act_Dep_Time, tr.CurrentStation_Sch_Arr_Time, tr.CurrentStation_Sch_Dep_Time
 from StationList st
 join train_Status_New tr
 on st.Code = tr.CurrentStation_Name
)
, next as
(
 select st.StationName, tr.RunId, tr.TrainNumber, tr.NextStation_Name 
 , tr.NextStation_Act_Arr_Time, tr.NextStation_Act_Dep_Time, tr.NextStation_Sch_Arr_Time, tr.NextStation_Sch_Dep_Time
 from StationList st
 join train_Status_New tr
 on st.Code = tr.NextStation_Name
)
, dest as
(
 select st.StationName, tr.RunId, tr.TrainNumber, tr.DestinationStation_Name 
 , tr.DestinationStation_Act_Arr_Time, tr.DestinationStation_Act_Dep_Time, tr.DestinationStation_Sch_Arr_Time, tr.DestinationStation_Sch_Dep_Time
 from StationList st
 join train_Status_New tr
 on st.Code = tr.DestinationStation_Name
) 
select distinct o.RunId, o.StationCode, o.RunDate, o.TrainNumber, t.Trainname, o.QueryRunDateTime
 , o.OriginStation_Name   , o.StationName O_StationName

例如，火车6063具有五个车站代码。因此，我的预期输出包含从Station_List获取的站点名称。

RunId   TrainNumber OriginStation_Name  Origin_Name     PrevStation_Name        Prev_Name       CurrentStation_Name   Current_Name  NextStation_Name        Next_Name       DestinationStation_Name    Destination_Name
    1       6063                MS      Chennai Egmore      VM              Villupuram Junction         NPM             NagaMalai       TDPR            TIRUPADRIPULYUR                 NCJ           Nagerkoil Junction

仅供参考：

version: Microsoft SQL Server 2012
这些表包含更多行。 Train_Status_new包含25列以上作为时间列。我不能补充。因为这些未在此要求中使用。

连续检查一到五列

0 个答案: