以前用過又忘了。。今天做資料匯出用到，記下。
oracle中的wmsys.wm_concat主要實現行轉列功能(說白了就是將查詢的某一列值使用逗號進行隔開拼接，成為一條資料)。
select d.id,
d.papid as 援助系統,
i.papname,
d.fid as 發貨單號,
d.fwdate as 發貨時間,
w.id,
w.wid as 發貨傳票號,
w.pwunit as 慈善會,
m.manyccfname,
w.standard as 規格,
s.standardname,
w.pwcname as 收貨人,
w.fwcount as 發貨數量,
w.ischeck as 是否確認,
w.pwcount as 實收數量多個規格,
w.losecount as 損失數量,
w.pwdate as 收貨時間,
to_char(wmsys.wm_concat(n.drugnum)) as 規格id,
to_char(wmsys.wm_concat(r.drugid)),
to_char(wmsys.wm_concat(r.shelflife)),
to_char(wmsys.wm_concat(n.drugcount)) as 規格對應藥品數量
from tb_dispatchlist d
left join tb_waybill w
on d.id = w.dlid
left join tb_waybillbydrugnum n
on w.id = n.wid
left join tb_druginfo r
on r.id = n.drugnum
left join tb_manyccfinfo m
on w.pwunit = m.id
left join tb_papinfo i
on i.id = d.papid
left join tb_pap_standard s
on s.id = w.standard
where d.dstatus = '0'
and w.statu = '0'
group by d.id,
d.papid,
i.papname,
d.fid,
d.fwdate,
w.id,
w.wid,
w.pwunit,
m.manyccfname,
w.standard,
s.standardname,
w.pwcname,
w.fwcount,
w.ischeck,
w.pwcount,
w.losecount,
w.pwdate
order by d.id desc, d.fwdate desc, w.wid asc;
如果只是單純的把乙個字段多行轉一列，上述是沒有問題的，只需使用wm_concat函式即可。但如上面**中所示，如果有多個欄位都需多行轉一列，該方法並不能解決資料對應問題，故仍需改進。
select t.did,
t.papid,
t.papname,
t.fid,
t.fwdate,
t.id,
t.wid,
t.pwunit,
t.manyccfname,
t.standard,
t.pwcname,
t.fwcount,
t.ischeck,
t.pwcount,
t.losecount,
t.pwdate,
t.remark,
max(t.drugidstr),
max(t.shelflifestr),
max(t.drugcountstr)
from (select d.id did,
w.papid,
i.papname,
d.fid,
d.fwdate,
w.id,
w.wid,
w.pwunit,
m.manyccfname,
w.standard,
s.standardname,
w.pwcname,
w.fwcount,
w.ischeck,
w.pwcount,
w.losecount,
w.pwdate,
w.remark,
wmsys.wm_concat(r.drugid) over(partition by w.id order by r.id) drugidstr,
wmsys.wm_concat(r.shelflife) over(order by r.id) shelflifestr,
wmsys.wm_concat(n.drugcount) over(order by r.id) drugcountstr
from tb_dispatchlist d
left join tb_waybill w
on d.id = w.dlid
left join tb_waybillbydrugnum n
on w.id = n.wid
left join tb_druginfo r
on r.id = n.drugnum
left join tb_manyccfinfo m
on w.pwunit = m.id
left join tb_papinfo i
on i.id = w.papid
left join tb_pap_standard s
on s.id = w.standard
where d.dstatus = '0'
and w.statu = '0'
and n.status = '0'
) tgroup by t.did,
t.papid,
t.papname,
t.fid,
t.fwdate,
t.id,
t.wid,
t.pwunit,
t.manyccfname,
t.standard,
t.standardname,
t.pwcname,
t.fwcount,
t.ischeck,
t.pwcount,
t.losecount,
t.pwdate,
t.remark
order by t.did desc, t.fwdate desc, t.wid asc
若不加 partition by 會報 "ora-01467 sort key too long" 錯誤
若有更加優化的sql，請指正。
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