Êàê ïîñ÷èòàòü êîëè÷åñòâî çàïèñåé ñ óñëîâèÿìè?
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Âîñêðåñåíüå, 11 Ìàÿ 2014 ã. 14:44
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Åñòü äâå òàáëèöû
Êëèåíòû
-ID
-Ôàìëèÿ
-Èìÿ
-Ãðóïïà
Ïðîïóñêè
-Êëèåíò
-Äàòà
Ñâÿçü Êëèåíòû.ID - Ïðîïóñêè.Êëèåíò îäèí êî ìíîãèì
Ïîñëå çàïîëíåíèÿ âûâîæó òàáëèöó òèïà
Êëèåíò |Äàòà ïðîïóñêà|
A | 01.05
B | 01.05
C | 01.05
B | 01.05
B | 01.05
A | 01.05
Íóæíî âûäàòü òàáëèöó ãäå áóäåò óêàçàíî êîëè÷åñòâî ïðîïóñêîâ çà îïðåäåëåííóþ äàòó ó êàæäîãî êëèåíòà
Òèïà:
Êëèåíò| Êîëè÷åñòâî ïðîïóñêîâ|
A | 2
B | 3
C | 1
Ñåé÷à åñòü ñëåäóþùèé çàïðîñ
SELECT Ôàìèëèÿ,Èìÿ,Ãðóïïà,×èñëî,
(SELECT COUNT(Êëèåíò) FROM Ïîñåùàåìîñòü WHERE (Êëèåíò=Êëèåíò) AND ( ×èñëî BETWEEN :pMinDate2 and :pMaxDate2 ) ) as Êîëè÷åñòâî_ïðîïóñêîâ
FROM Êëèåíòû,Ïðîïóñêè
WHERE (Êëèåíòû.ID = Ïîñåùàåìîñòü.Êëèåíò) AND (×èñëî BETWEEN :pMinDate and :pMaxDate)
Íî îí â ñòîëáöå Êîëè÷åñòâî ïðîïóñêîâ âûäàåò êîëè÷åñòâî âñåõ êëèåíòîâ êîòîðûå åñòü çà îïðåäåëåííóþ äàòó
Ò.å. âûäàåò ñëåäóþùåå
Êëèåíò| Êîëè÷åñòâî ïðîïóñêîâ|
A | 6
B | 6
C | 6
Ïîäñêàæèòå ïîæàëóéñòà êàê èçìåíèòü çàïðîñ ÷òî áû âûäàëî òîëüêî êîëè÷åñòâî ïðîïóñêîâ ó îïðåäåëåííîãî êëèåíòà?
http://www.sql.ru/forum/1093893/kak-poschitat-kolichestvo-zapisey-s-usloviyami
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