SQL存在不工作

我有SQL查詢低於列出商店SQL存在不工作

每當我得到「所有城市類型」中的citytypename領域，我並不需要列出其他行的特定storelocationid

結果

71 8 0 All City Types West Dhanalakshmi store  All Cities All States 
71 8 1 Tier 2   West Dhanalakshmi store  Bangalore  Karnataka 
71 8 2 Tier 2   West Dhanalakshmi store  Ahmedabad  Gujarat

如何，我將重寫我的查詢呢？

SELECT LL.StoreLocationID 
     ,LC.[StoreID] 
     ,ISNULL(LC.CityID,0) CityID 
     ,ISNULL(C.CityTypeName,'All City Types') CityTypeName 
     ,ISNULL(LL.RegionName,'All Regions') RegionName 
     ,L.[Name] StoreName 
     ,ISNULL(C.Name,'All Cities') AS CityName 
     ,ISNULL(S.Name, 'All States') AS StateName 
FROM [StoreCity] LC 
    INNER JOIN [Store] L ON L.[StoreID] = LC.[StoreID] 
    INNER JOIN [StoreLocation] LL ON LL.StoreID=LC.StoreID 
    LEFT OUTER JOIN [City] C ON LC.CityID = C.CityID 
    LEFT OUTER JOIN [State] S ON C.StateID = S.StateID 
WHERE StoreLocationID = 71 
AND (
    /* current row is 'All City Types' */ 
    C.CityTypeName IS NULL 
    OR 
    /* current row is not 'All City Types', 
     but there does not exist another row that is. */ 
    NOT EXISTS (
     SELECT 1 
     FROM [StoreLocation] LL2 ON LL2 
     INNER JOIN [StoreCity] LC2 ON LC2.[StoreID] = LL2.[StoreID] 
     INNER JOIN [City] C2 ON C2.[CityID] = LC2.[CityID] 
     WHERE LL2.StoreLocationID = LL.StoreLocationID 
     AND C2.CityTypeName IS NULL 
    ) 
)

來源

2011-09-09 Smart

從你的問題，我不能確定哪些表包含，或者基數關係，它們之間是什麼（除了城市和州當然）每家商店都有很多商店的大賣場？或者是多個地點的一家商店？或兩者？什麼是關係結構？ –

這些'NULL'存儲在'CityTypeName'中嗎？還是它們是從左邊的外連接生成的？ –

你能解釋WHERE子句中子查詢的用途嗎？它過濾出什麼標準？ –

我想你正在嘗試查找DISTINCT並可能找到相應的GROUP BY。

事情是這樣的：

SELECT DISTINCT ISNULL(C.CityTypeName,'All City Types') CityTypeName FROM ...

來源

2011-09-09 04:13:05

SELECT final .StoreLocationID 
     ,final .[StoreID] 
     ,final .CityID 
     ,final .CityTypeName 
     ,final .RegionName 
     ,final .StoreName 
     ,final .CityName 
     ,final .StateName from (SELECT LL.StoreLocationID 
     ,LC.[StoreID] 
     ,ISNULL(LC.CityID,0) CityID 
     ,ISNULL(C.CityTypeName,'All City Types') CityTypeName 
     ,ISNULL(LL.RegionName,'All Regions') RegionName 
     ,L.[Name] StoreName 
     ,ISNULL(C.Name,'All Cities') AS CityName 
     ,ISNULL(S.Name, 'All States') AS StateName FROM [StoreCity] LC 
    INNER JOIN [Store] L ON L.[StoreID] = LC.[StoreID] 
    INNER JOIN [StoreLocation] LL ON LL.StoreID=LC.StoreID 
    LEFT OUTER JOIN [City] C ON LC.CityID = C.CityID 
    LEFT OUTER JOIN [State] S ON C.StateID = S.StateID WHERE StoreLocationID = 71 AND ( /* current row is 'All City Types' */ C.CityTypeName IS NULL OR  /* current row is not 'All City Types', 
     but there does not exist another row that is. */ NOT EXISTS (
     SELECT 1 
     FROM [StoreLocation] LL2 ON LL2 
     INNER JOIN [StoreCity] LC2 ON LC2.[StoreID] = LL2.[StoreID] 
     INNER JOIN [City] C2 ON C2.[CityID] = LC2.[CityID] 
     WHERE LL2.StoreLocationID = LL.StoreLocationID 
     AND C2.CityTypeName IS NULL )) ORDER BY FIELD("All City Types", CityTypeName) DESC) as final group by final.StoreLocationID

試試這個，沒有測試...

來源

2011-09-09 05:49:48 sujal

SQL存在不工作

回答

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