訪問SQL語法

Question

任何人都可以幫助我在下面的查詢語法？

我不斷收到以下錯誤消息：select語句包含保留字或拼寫錯誤或缺少變量名，或標點符號不正確。

我在一遍又一遍地看，仍然無法找到它。我需要一套新的眼睛：

SELECT [Locations].[Property], 
    [Cores].Location, 
    [Cores].Core, 
    [Keys].Core, 
    Count ([Keys].[Key Seq]) AS [CountOfKey Seq] 
FROM [Cores], [Locations], [Keys] 
WHERE (
    [Cores].Location = [Locations].Location 
    and [Cores].Core = [Keys].Core) 
    and (((Keys.[Key Seq])<>0)) 
GROUP BY Locations.[Property], [Cores].Location, [Cores].Core,[Keys].Core 
HAVING (((Keys.Core)<>"No Lock")) 
UNION SELECT [Locations].[Property], 
    [Cores].Location, 
    [core_crosswalk].related_core as Core, 
    [Keys].[Key Seq], Count ([Keys].[Key Seq]) AS [CountOfKeySeq], 
FROM [Cores], [Locations], [Keys], [core_crosswalk] 
WHERE (
    [Cores].Location = [Locations].Location, 
    and [Cores].Core = [core_crosswalk].core, 
    and [core_crosswalk].related_core = [Keys].Core), 
    and (((Keys.[Key Seq])<>0)) 
GROUP BY Locations.[Property], Cores.Core 
HAVING (((Keys.Core)<>"No Lock")) 
ORDER BY 1, 2, 4; 

Answer 1

嘗試以下操作：

SELECT [Locations].[Property], 
    [Cores].Location, 
    [Cores].Core as Core, 
    Count ([Keys].[Key Seq]) AS [CountOfKey Seq] 
FROM ([Cores] INNER JOIN [Locations] ON [Cores].Location = [Locations].Location) 
INNER JOIN [Keys] ON [Cores].Core = [Keys].Core 
WHERE 
    (Keys.[Key Seq]<>0 AND Cores.Core<>"No Lock") 
GROUP BY Locations.[Property], [Cores].Location, [Cores].Core 
UNION 
SELECT [Locations].[Property], 
    [Cores].Location, 
    [cores].Core, 
    Count ([Keys].[Key Seq]) AS [CountOfKeySeq] 
FROM (([Cores] INNER JOIN [Locations] ON [Cores].Location = [Locations].Location) 
INNER JOIN [core_crosswalk] ON [Cores].Core = [core_crosswalk].core) 
INNER JOIN [Keys] ON [core_crosswalk].related_core = [Keys].Core 
WHERE (Keys.[Key Seq]<>0 AND Keys.Core<>"No Lock") 
GROUP BY Locations.[Property], Cores.Core,[Cores].Location 
ORDER BY 1, 2, 4; 

正如你可以看到我已經改了不少，所以你需要檢查它是給你什麼你要。最大的變化是使用JOIN語法而不是WHERE。這使得SQL更具可讀性，並且也是我更改某些字段的原因 - 如果您加入某個字段，則無論您使用哪個表的值，因爲它們是相同的！

我對整潔的緣故組合WHERE和HAVINGs在一起，但你可以把它們分開。

此外，在工會，兩半的類型和數量必須匹配。我不確定[Key Seq]的類型，它聽起來像一個整數索引。如果是，那麼你不能在SELECT中擁有它（這意味着它必須在GROUP BY中），如果你想要[Key Seq]的計數，否則計數將始終爲1.

Now如果您將兩部分分爲不同的查詢，您將能夠在Access查詢設計中查看它們 - 如果您需要重新安排事項，您可能會發現這很有用。