Question

我需要找出过去6个月内哪些司机没有购买燃料。

我有两个表TransactionReport（过去6个月的所有交易）和DriverList（所有驱动程序）

TransactionReport
DriverID  |  DriverLastName | DriverFirstName | Other Columns not used for this query

DriverList
DriverID  |  DriverLastName | DriverFirstName | Other Columns not used for this query

我想返回DriverList中未列出的DriverList中列出的所有DriverID。

结果应该给我以下

DriverID  |  DriverLastName | DriverFirstName

Answer 1

左外连接只在右表中获得NULL结果应该可以正常工作

select distinct driverlist.driverid, driverlist.driverlastname, driverlist.driverfirstname
from driverlist
left outer join transactionreport
on driverlist.driverid = transactionreport.driverid
where transactionreport.driverid is null

Answer 2

select 
    DriverID, DriverLastName, DriverFirstName

from
    DriverList

where
    DriverID not in (select DriverID from TransactionReport)

Answer 3

SELECT dl.DriverID , dl.DriverLastName, dl.DriverFirstName FROM DriverList dl
 LEFT JOIN TransactionReport tr ON  dl.DriverID  = tr.DriverID  
WHERE tr.DriverID IS NULL

Answer 4

你可以像前面提到的那样做：

Select dl.DriverID , dl.DriverLastName, dl.DriverFirstName From DriverList dl
 LEFT Join TransactionReport tr on  dl.DriverID  = tr.DriverID  
WHERE tr.DriverID is Null

哪个会奏效。但是，使用反半连接可以获得更快的结果和更可读的查询。似乎MS Access的更高版本支持这一点：

SELECT dl.DriverID, dl.DriverLastName, dl.DriverFirstName From DriverList dl
WHERE NOT EXISTS (
     SELECT tr.DriverID 
     FROM TransactionReport tr 
     WHERE tr.DriverID = dl.DriverID)

这里的关键是要注意EXISTS语句中的WHERE。 NOT逻辑已经在EXISTS前面，所以你必须在语句中测试相等性。

Access中的SQL查询列出了不在两个表中的值

4 个答案: