Sqlserver纯粹意义上的行列转换.docx

首先还是用例子来说明一下这个我所谓的“纯粹意义”假设有下面这样一个表：CIDAIDQ- - -C1M11C2M12C3M13C4M21C5M22我们要得到的效果是这样的：字段12345- - - - - -AIDM1M1M1M2M2Q12312CIDC1C2C3C4C5就是列变行，不需要做其他处理。下面示例可以实现这个效果：declareCtable(CIDvarchar(2),AIDvarchar(2),Qint)insertintoCselectC1,M1,1unionallselectC2,M1,2unionallselectC3,M1,3unionallselectC4,M2,1unionallselectC5,M2,2select*fromC;withCas(selectrow_number()over(orderbyCID)row,CIDfromC)selectCIDas字段,1=Max(casewhenrow%6=1thenRTRIM(CID)elseend),2=Max(casewhenrow%6=2thenRTRIM(CID)elseend),3=Max(casewhenrow%6=3thenRTRIM(CID)elseend),4=Max(casewhenrow%6=4thenRTRIM(CID)elseend),5=Max(casewhenrow%6=5thenRTRIM(CID)elseend)into#tfromCgroupby(row-1)/6;withDas(selectrow_number()over(orderbyCID)row,AIDfromC)insertinto#tselectAIDas字段,1=Max(casewhenrow%6=1thenRTRIM(AID)elseend),2=Max(casewhenrow%6=2thenRTRIM(AID)elseend),3=Max(casewhenrow%6=3thenRTRIM(AID)elseend),4=Max(casewhenrow%6=4thenRTRIM(AID)elseend),5=Max(casewhenrow%6=5thenRTRIM(AID)elseend)fromDgroupby(row-1)/6;withEas(selectrow_number()over(orderbyCID)row,QfromC)insertinto#tselectQas字段,1=Max(casewhenrow%6=1thenRTRIM(Q)elseend),2=Max(casewhenrow%6=2thenRTRIM(Q)elseend),3=Max(casewhenrow%6=3thenRTRIM(Q)elseend),4=Max(casewhenrow%6=4thenRTRIM(Q)elseend),5=Max(casewhenrow%6=5thenRTRIM(Q)elseend)fromEgroupby(row-1)/6select*from#tdroptable#t/*CIDAIDQ- - -C1M11C2M12C3M13C4M21C5M22字段12345- - - - - -AIDM1M1M1M2M2Q12312CIDC1C2C3C4C5*/我们也可以在创建一个表来放表结构。declare表结构table(字段varchar(5),类型varchar(7)insertinto表结构selectCID,varcharunionallselectAID,varcharunionallselectQ,intunionallselectCName,varcharselect*from表结构declareCtable(CIDvarchar(2),AIDvarchar(2),Qint)insertintoCselectC1,M1,1unionallselectC2,M1,2unionallselectC3,M1,3unionallselectC4,M2,1unionallselectC5,M2,2select*fromC;withCas(selectrow_number()over(orderbyCID)row,CIDfromC)selectCIDas字段,1=Max(casewhenrow%6=1thenRTRIM(CID)elseend),2=Max(casewhenrow%6=2thenRTRIM(CID)elseend),3=Max(casewhenrow%6=3thenRTRIM(CID)elseend),4=Max(casewhenrow%6=4thenRTRIM(CID)elseend),5=Max(casewhenrow%6=5thenRTRIM(CID)elseend)into#tfromCgroupby(row-1)/6;withDas(selectrow_number()over(orderbyCID)row,AIDfromC)insertinto#tselectAIDas字段,1=Max(casewhenrow%6=1thenRTRIM(AID)elseend),2=Max(casewhenrow%6=2thenRTRIM(AID)elseend),3=Max(casewhenrow%6=3thenRTRIM(AID)elseend),4=Max(casewhenrow%6=4thenRTRIM(AID)elseend),5=Max(casewhenrow%6=5thenRTRIM(AID)elseend)fromDgroupby(row-1)/6;withEas(selectrow_number()over(orderbyCID)row,QfromC)insertinto#tselectQas字段,1=Max(casewhenrow%6=1thenRTRIM(Q)elseend),2=Max(casewhenrow%6=2thenRTRIM(Q)elseend),3=Max(casewhenrow%6=3thenRTRIM(Q)elseend),4=Max(casewhenrow%6=4thenRTRIM(Q)elseend),5=Max(casewhenrow%6=5thenRTRIM(Q)elseend)fromEgroupby(row-1)/6select*from表结构aleftjoin#t bona.字段=b.字段droptable#t/*字段类型- -CIDvarcharAIDvarcharQintCName varcharCIDAIDQ- - -C1M11C2M