打開一個類別爲列在SQL Server

Question

我有一個查詢，給出的結果是一些屬性categorizedm但我需要每一個類別變成一列

這是我的查詢：

SELECT hist_statusevents.eqmt, 
     hist_exproot.shiftdate, 
     hist_statusevents.category, 
     Sum(hist_statusevents.duration/3600) as Value 
FROM Powerview.dbo.hist_eqmtlist hist_eqmtlist, 
    Powerview.dbo.hist_exproot hist_exproot, 
     Powerview.dbo.hist_statusevents hist_statusevents 
WHERE hist_exproot.shiftindex = hist_statusevents.shiftindex And 
     hist_statusevents.shiftindex = hist_eqmtlist.shiftindex And 
     hist_statusevents.eqmt = hist_eqmtlist.eqmtid And 
     hist_statusevents.eqmt like 'MOTO%' 
GROUP BY hist_statusevents.eqmt, 
     hist_exproot.shiftdate, 
     hist_statusevents.category 

這是查詢的輸出：

eqmt   shiftdate   category Value 
MOTO705   2011-01-22 00:00:00 5  13,9597222805023 
MOTO706   2011-01-28 00:00:00 3  0,280277773737907 
MOTO704   2011-02-17 00:00:00 6  8,92749977111816 
MOTO705   2011-02-09 00:00:00 6  10,07972240448 
MOTO703   2011-03-15 00:00:00 1  22,6561107933521 
MOTO704   2011-03-11 00:00:00 5  24 
MOTO706   2011-01-27 00:00:00 1  9,95361125469208 
MOTO703   2011-03-16 00:00:00 6  3,79916667938232 
MOTO704   2011-01-08 00:00:00 6  24 

但我需要得到的結果是這樣的：

eqmt   shiftdate   1 2 3 4 5 6 7 
MOTO706   2011-01-28 00:00:00 values for each category 
MOTO704   2011-02-17 00:00:00 
MOTO705   2011-02-09 00:00:00 
MOTO703   2011-03-15 00:00:00 

我一直在試圖與選擇的情況下，但我不能讓結構工程

Answer 1

如果類別值是固定的，都在範圍（1,7），那麼你可以使用基於案例的聚集像下面 如果類別值是動態的，則需要使用動態sql來執行pivot

SELECT hist_statusevents.eqmt, 
     hist_exproot.shiftdate, 
     sum(case when hist_statusevents.category =1 then (hist_statusevents.duration/3600) else 0 end) as '1', 
     sum(case when hist_statusevents.category =2 then (hist_statusevents.duration/3600) else 0 end) as '2', 
     sum(case when hist_statusevents.category =3 then (hist_statusevents.duration/3600) else 0 end) as '3', 
     sum(case when hist_statusevents.category =4 then (hist_statusevents.duration/3600) else 0 end) as '4', 
     sum(case when hist_statusevents.category =5 then (hist_statusevents.duration/3600) else 0 end) as '5', 
     sum(case when hist_statusevents.category =6 then (hist_statusevents.duration/3600) else 0 end) as '6', 
     sum(case when hist_statusevents.category =7 then (hist_statusevents.duration/3600) else 0 end) as '7' 

FROM Powerview.dbo.hist_eqmtlist hist_eqmtlist, Powerview.dbo.hist_exproot hist_exproot, Powerview.dbo.hist_statusevents hist_statusevents 
WHERE hist_exproot.shiftindex = hist_statusevents.shiftindex And hist_statusevents.shiftindex = hist_eqmtlist.shiftindex And hist_statusevents.eqmt = hist_eqmtlist.eqmtid And hist_statusevents.eqmt like 'MOTO%' 
GROUP BY hist_statusevents.eqmt, hist_exproot.shiftdate