帮忙看一下几个简单的SQl查询语句~
Select DISTINCT Customers.CustomerID,Customers.CompanyName
From Customers JOIN Orders ON
(Customers.CustomerID=Orders.CustomerID)
Where Orders.ShippedDate> 'May 1 1998 '
我不太明白的就是第二行和第三行! 帮忙解释一下 先谢过!
[解决办法]
Select DISTINCT Customers.CustomerID,Customers.CompanyName
From Customers JOIN Orders ON //内连接
(Customers.CustomerID=Orders.CustomerID)//将两个表ID相同进行连接
Where Orders.ShippedDate> 'May 1 1998 '
