Question

在MS Access 2003 SP3中工作：我正在运行一个查询，以查找在交付日期之后出售的“汽车”。我有成千上万的行。完成所有操作后，我想为每辆“汽车”设置一些行，然后是最早的日期。有什么建议吗？

CAR          DATE ORDERED   DATE DELIVERED  CUSTOMER NUMBER DATE SOLD
FORD MUSTANG    20061002             20080413            ABC123          20080422
FORD MUSTANG    20061002             20080413            ABC124          20080429
CHEVY IMPALA    20061002             20080413            ABC125          20080505

Answer 1

如果你有一个ID字段，这可能会更好：

DELETE 
FROM Cars
WHERE Cars.DATESOLD Not In (
             SELECT TOP 5 DateSold 
             FROM Cars c 
             WHERE c.Car=Cars.Car 
             ORDER BY DateSold DESC) 
And Cars.DATESOLD Not In (
             SELECT TOP 1 DateSold 
             FROM Cars c 
             WHERE c.Car=Cars.Car 
             ORDER BY DateSold)

如果有重复日期，您最终将获得超过5条记录。

查询根据最早的日期消除多行

1 个答案: