Question

任何人都可以找到此MS Access查询的错误吗？当我尝试执行它时，我在第二次左连接之前收到有关缺少操作符的错误

SELECT * FROM (
SELECT  GetitUsageTemp.MemberID, 
    GetitUsageTemp.IDNumber, 

    GetitUsageTemp.Title, 
    GetitUsageTemp.Initials, 
    GetitUsageTemp.Forenames, 
    GetitUsageTemp.Surnames, 
    GetitUsageTemp.CellNumber, 
    GetitUsageTemp.EmailAddress,

    Nz(August.[AugustUsage],0) AS AugustUsage

FROM GetitUsageTemp 
LEFT  JOIN
(SELECT dbo_Requests.fk_Members_ID, Count(dbo_Requests.Log_date) AS JulyUsage
FROM dbo_Requests
WHERE dbo_Requests.Log_date Between #07/01/2013# And #08/01/2013#
GROUP BY dbo_Requests.fk_Members_ID
) Requests
ON GetitUsageTemp.MemberID = Requests.fk_Members_ID

LEFT  JOIN 

(SELECT dbo_Requests.fk_Members_ID, Count(dbo_Requests.Log_date) AS AugustUsage
FROM dbo_Requests
WHERE dbo_Requests.Log_date Between #08/01/2013# And #09/01/2013#
GROUP BY dbo_Requests.fk_Members_ID
) August
ON GetitUsageTemp.MemberID = August.fk_Members_ID
)GETIT

Answer 1

在Access中，您只能加入两个表。如果需要连接更多表，则需要使用括号将第一个连接组合在一起，就好像它是一个新的派生表一样。然后，您可以将另一个表加入该组：

select
  *
from
  ( ( Table1 
      LEFT JOIN Table2 ...
    )
    LEFT JOIN Table3 ...
  )
  LEFT JOIN Table4 ...

（我正在使用笨拙的缩进试图让这些组更清晰）

MS Access多连接查询

1 个答案: