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我正在尝试执行下面的 SQL 查询（在 Access DB 中），但出现类型不匹配错误。

SELECT S1.[Main Project] AS Company, S1.[Main Link] AS Project, S1.[Name] AS Milestone, S1.[Start] As MilestoneDueDate, 
S2.[Name] As Successor1, S2.[Start] as SuccessorDueDate1, 
S3.[Name] As Successor2, S2.[Start] as SuccessorDueDate2, 
S4.[Name] As Successor3, S2.[Start] as SuccessorDueDate3, 
S5.[Name] As Successor4, S2.[Start] as SuccessorDueDate4, 
S6.[Name] As Successor5, S2.[Start] as SuccessorDueDate5, 
S7.[Name] As Successor6, S2.[Start] as SuccessorDueDate6, 
S8.[Name] As Successor7, S2.[Start] as SuccessorDueDate7, 
S9.[Name] As Successor8, S2.[Start] as SuccessorDueDate8, 
S10.[Name] As Successor9, S2.[Start] as SuccessorDueDate9, 
S11.[Name] As Successor10, S2.[Start] as SuccessorDueDate10

FROM ((((((((((Sheet1 AS S1 
INNER JOIN Sheet1 AS S2 
ON S1.[Outcoming Task 1] = S2.[ID])
INNER JOIN Sheet1 AS S3 
ON S1.[Outcoming Task 2] = S3.[ID])
INNER JOIN Sheet1 AS S4 
ON S1.[Outcoming Task 3] = S4.[ID])
INNER JOIN Sheet1 AS S5 
ON S1.[Outcoming Task 4] = S5.[ID])
INNER JOIN Sheet1 AS S6 
ON S1.[Outcoming Task 5] = S6.[ID])
INNER JOIN Sheet1 AS S7 
ON S1.[Outcoming Task 6] = S7.[ID])
INNER JOIN Sheet1 AS S8 
ON S1.[Outcoming Task 7] = S8.[ID])
INNER JOIN Sheet1 AS S9 
ON S1.[Outcoming Task 8] = S9.[ID])
INNER JOIN Sheet1 AS S10 
ON S1.[Outcoming Task 9] = S10.[ID])
INNER JOIN Sheet1 AS S11
ON S1.[Outcoming Task 10] = S11.[ID])

WHERE S1.Start >S2.[Start]
OR S1.Start >S3.[Start]
OR S1.Start >S4.[Start]
OR S1.Start >S5.[Start]
OR S1.Start >S6.[Start]
OR S1.Start >S7.[Start]
OR S1.Start >S8.[Start]
OR S1.Start >S9.[Start]
OR S1.Start >S10.[Start]
OR S1.Start >S11.[Start]

ORDER BY S1.[Main Project]

我是否正确使用了内部连接？

我知道这个表很糟糕（实际上开发它的人应该创建了一个关系表），但它就是这样:(

有没有更优雅的方法来解决它？

谢谢！

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1 回答 1

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类型不匹配表明 Access 正在尝试比较两种不同类型的事物。可能是您的 20 个比较语句中的一个或多个导致了这种情况。我建议您尝试使用简单的查询来重现此错误，例如：

select 1 from Sheet1 as S1 inner join Sheet1 as S2
   on S1.[Outcoming Task 1] = S2.[ID];

以这种方式测试不同的字段，直到您看到类型不匹配的位置。

至于更优雅的解决方案，这取决于您要做什么。如果您使用此查询目标的描述更新您的问题，我们可以提供更好的解决方案。

如果您必须对这些数据进行大量工作，我建议您尽快将其从错误格式中删除。如果您可以重组源文件，那就太好了。如果不是，那么创建自己的以逻辑方式格式化的临时表并使用它们来完成您需要做的任何工作仍然是值得的。

于 2012-12-12T13:55:15.963 回答