连接两个表，并导致结果

来两次，我有我的查询中，从两个表中提取数据的选择命令，结果的每一行中的结果来两次，我的查询是连接两个表，并导致结果

Select 
    Driver.DriverID, 
    Driver.FName, 
    Driver.LName, 
    Driver.SmartCardNumber, 
    Driver.DriverState, 
    Driver.DriverCity, 
    Driver.DriverAddress, 
    Driver.Mobile, 
    Driver.Telephone, 
    Driver.MelliCardNumber, 
    Driver.CertificatePublisher, 
    Driver.addeddate, 
    Driver.ContractorID, 
    Driver.editeddate, 
    Contractor.name 
From Driver,Contractor

来源

2012-09-07 Moslem7026

你需要哪里条件是驾驶员和承包商表之间是否存在关系。

像

Select 
    Driver.DriverID, 
    Driver.FName, 
    Driver.LName, 
    Driver.SmartCardNumber, 
    Driver.DriverState, 
    Driver.DriverCity, 
    Driver.DriverAddress, 
    Driver.Mobile, 
    Driver.Telephone, 
    Driver.MelliCardNumber, 
    Driver.CertificatePublisher, 
    Driver.addeddate, 
    Driver.ContractorID, 
    Driver.editeddate, 
    Contractor.name 
From Driver,Contractor 
    where Driver.ContractorID = Contractor.id

假设ContractorID是与承包商的ID。

来源

2012-09-07 15:42:13 Jignesh

可能'Driver.ContractorID'根据他的查询 –

@KDiTraglia是的，你是对的。谢谢我会改变我的答案.. – Jignesh

您可以尝试使用DISTINCT。

SELECT DISTINCT Driver.DriverID, 
Driver.FName, 
Driver.LName, 
Driver.SmartCardNumber, 
Driver.DriverState, 
Driver.DriverCity, 
Driver.DriverAddress, 
Driver.Mobile, 
Driver.Telephone, 
Driver.MelliCardNumber, 
Driver.CertificatePublisher, 
Driver.addeddate, 
Driver.ContractorID, 
Driver.editeddate, 
Contractor.name 

From Driver,Contractor

或者，如果你不需要交叉结果，那么你可以尝试做一个LEFT或INNER JOIN如果你有两个表之间的引用

来源

2012-09-07 15:43:32

你需要告诉DBMS如何从表2加入记录：

例如

Select 
    Driver.DriverID, 
    Driver.FName, 
    ..., 
    Contractor.name 
    From Driver,Contractor 
    Where Driver.ContractorID = Contractor.ID;

或者

Select 
    Driver.DriverID, 
    Driver.FName, 
    ..., 
    Contractor.name 
    From Driver inner join Contractor 
    On Driver.ContractorID = Contractor.ID;

来源

2012-09-07 15:45:05

Select Driver.DriverID, 
Driver.FName, 
Driver.LName, 
Driver.SmartCardNumber, 
Driver.DriverState, 
Driver.DriverCity, 
Driver.DriverAddress, 
Driver.Mobile, 
Driver.Telephone, 
Driver.MelliCardNumber, 
Driver.CertificatePublisher, 
Driver.addeddate, 
Driver.ContractorID, 
Driver.editeddate, 
Contractor.name 
From Driver,Contractor 
where Driver.DriverId=Contractor.DriverId;

（提一些这样的条件以便获取数据）

来源

2012-09-07 15:46:02 cxyz

连接两个表，并导致结果

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