第二種情況SELECT查詢

裏面我有這個簡單的查詢（TSQL） -第二種情況SELECT查詢

SELECT IdTour, Tour, TourOrder, IdContent 
    FROM View_ToursListContentId 
    WHERE (IdContent = 3) OR (IdContent = 4) 
    ORDER BY TourOrder DESC, Tour

下面是結果

58 Air & Style Tour     2015/16 NULL 3 
48 FIS Europa Cup      2015/16 NULL 3 
46 FIS World Cup Tour     2015/16 NULL 3 
131 KDC Grand Slam Regional Qualifiers 2016  NULL 3 
59 Swatch Freeride World Tour   2016  NULL 3 
77 World Rookie Tour     2015/16 NULL 3 
57 World Snowboard Tour    2015/16 NULL 3 
45 X Games       2016  NULL 3 
45 X Games       2016  NULL 4

我需要做的是。如果ther在IdContent = 3的結果IdTour中，則不顯示與IdContent = 4相同的IdTour。（僅在IdContent = 4時顯示IdTour，如果IdContent = 3時沒有相同的IdTour - 在我的情況下，只顯示一個IdTour 45與IdContent 3）

什麼是最簡單和最快的方式，我怎麼能實現它？

感謝名單了很多

來源

2016-08-17 Jan Šalomoun

添加預期的結果，以及！ – jarlh

一種方法包括使用NOT EXISTS：

SELECT IdTour, Tour, TourOrder, IdContent 
FROM View_ToursListContentId t1 
WHERE (IdContent = 3) OR 
     ((IdContent = 4) AND NOT EXISTS (SELECT 1 
             FROM View_ToursListContentId t2 
             WHERE t1.IdTour = t2.IdTour AND 
              t2.IdContent = 3)) 
ORDER BY TourOrder DESC, Tour

的NOT EXISTS運營商篩選出具有IdContent = 4記錄案件的同一IdTour和IdContent = 3存在的記錄。

來源

2016-08-17 15:04:07

-1

，你應該只使用group by IdContent查詢像

SELECT IdTour, Tour, TourOrder, IdContent 
    FROM View_ToursListContentId 
    WHERE (IdContent = 3) OR (IdContent = 4) 
group by IdContent 
    ORDER BY TourOrder DESC, Tour

來源

2016-08-17 15:05:01 Rohit

這甚至不會運行，即使它會 - 它不會給出正確的結果... – Milney

更不用說你真的應該解釋你的答案，而不是僅僅粘貼代碼。 – logixologist

你可以使用一個窗口函數來獲得最低IdContent用於該IdTour：

SELECT IdTour, 
     Tour, 
     TourOrder, 
     IdContent, 
     MinIdContent = MIN(IdContent) OVER(PARTITION BY IdTour) 
FROM View_ToursListContentId 
WHERE IdContent IN (3, 4);

然後如果這則是3你只選擇3，如果是4，則只選擇4，或者更簡單地說，只選擇與最小值匹配的IdContent：

SELECT IdTour, Tour, TourOrder, IdContent 
FROM ( SELECT IdTour, 
        Tour, 
        TourOrder, 
        IdContent, 
        MinIdContent = MIN(IdContent) OVER(PARTITION BY IdTour) 
      FROM View_ToursListContentId 
      WHERE IdContent IN (3, 4) 
     ) AS t 
WHERE IdContent = MinIdContent;

完整的例子

WITH View_ToursListContentId AS 
( SELECT IdTour, Tour, TourOrder, IdContent 
    FROM (VALUES 
       (58, 'Air & Style Tour 2015/16', NULL, 3), 
       (48, 'FIS Europa Cup 2015/16', NULL, 3), 
       (46, 'FIS World Cup Tour 2015/16', NULL, 3), 
       (131, 'KDC Grand Slam Regional Qualifiers 2016', NULL, 3), 
       (59, 'Swatch Freeride World Tour 2016', NULL, 3), 
       (77, 'World Rookie Tour 2015/16', NULL, 3), 
       (57, 'World Snowboard Tour 2015/16', NULL, 3), 
       (45, 'X Games 2016', NULL, 3), 
       (45, 'X Games 2016', NULL, 4) 
      ) t (IdTour, Tour, TourOrder, IdContent) 
) 
SELECT IdTour, Tour, TourOrder, IdContent 
FROM ( SELECT IdTour, 
        Tour, 
        TourOrder, 
        IdContent, 
        MinIdContent = MIN(IdContent) OVER(PARTITION BY IdTour) 
      FROM View_ToursListContentId 
      WHERE IdContent IN (3, 4) 
     ) AS t 
WHERE IdContent = MinIdContent;

來源

2016-08-17 15:15:24 GarethD

select * from (
select row_number() over (partition by IdTour, Tour, TourOrder order by IdContent) rownum, 
IdTour, Tour, TourOrder, IdContent from View_ToursListContentId)src 
where rownum=1

來源

2016-08-17 15:22:39

第二種情況SELECT查詢

回答

相關問題