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Ñòàòèñòèêà LiveInternet.ru: ïîêàçàíî êîëè÷åñòâî õèòîâ è ïîñåòèòåëåé
Ñîçäàí: 16.03.2006
Çàïèñåé:
Êîììåíòàðèåâ:
Íàïèñàíî: 4


Êàê ðàçâåðíóòü òàáëèöó (èìåíà ïîëåé íåèçâåñòíû)

Ïîíåäåëüíèê, 04 Ñåíòÿáðÿ 2017 ã. 15:33 + â öèòàòíèê
Äîáðîãî äíÿ ãîñïîäà !

Èìåþ òàáëèöó T1
F0 F1 F2
R1 100 200


Ïîëó÷èòü ðåçóëüòàò
F0 KEY VAL
R1 F1 100
R1 F2 200


Âîçìîæíûé çàïðîñ
select  A.F0,
          B.F1,
          iif(B.F1='F1',A.F1,iif(B.F1='F2',A.F2,Null)) F2
   from T1  A
 inner join (select 'F1' F1 from TEMP
                 union all
                 select 'F2' F1 from TEMP
               ) B
  on (1=1)


ÍÎ !!!!!!!
Ïðîáëåìà â òîì ÷òî ñïèñîê ïîëåé ìíå íåèçâåñòåí (T1 ýòî êíèãà Excel - ïîëüçîâàòåëü ìîæåò ìåíÿòü èìåíà ïîëåé èõ êîë-âî)
Ñïèñîê è íàçâàíèÿ ïîëåé ÿ ðåàëüíî äîñòàòü ìîãó â âèäå ñòðîêè 'F1','F2'...
(select 'F1' F1 from TEMP
union all
select 'F2' F1 from TEMP
) B

Íî îáðàáîò÷èê ïðèéäåòñÿ âñå âðåìÿ äîïèñûâàòü ðóêàìè
iif(B.F1='F1',A.F1,iif(B.F1='F2',A.F2,....................................)) F2

Åñòü ëè åùå âàðèàíòû ðàçâåðíóòü òàáëèöó ?
Ìîæåò â Microsoft Jet (èñïîëüçóþ åãî) åñòü âîçìîæíîñòü ñîñëàòüñÿ íà ïîëå òàáëèöû ÷åðåç ñòðîêó

Ò.å. òàê
select  A.F0,
          B.F1,
          A.Fields(B.F1) F2
   from T1  A
 inner join (select 'F1' F1 from TEMP
                 union all
                 select 'F2' F1 from TEMP
               ) B
  on (1=1)


Çàðàíåå áëàãîäàðåí !

http://www.sql.ru/forum/1270606/kak-razvernut-tablicu-imena-poley-neizvestny


 

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