Question

I’m using this Query but I have it wrong…

SELECT * FROM [Orders]
JOIN [Customers]
ON [Orders].[CustomerID] = [Customers].[CustomerID]
WHERE [Orders].[OrderDate] BETWEEN '2010/1/1' AND '2011/1/1'
AND [Orders].[Total] > 1

I’m getting a Duplicate Column name error for CustomerID. I’m not sure how to use an Alias for this to work.

Could someone show me how to write it correctly.

EDIT:

Thanks for all the suggestions, here’s what I can out with.

SELECT DISTINCT Orders.CustomerID, Orders.ShipToID, Orders.ShipName, Orders.ShipAddress, Orders.ShipAddress2, Orders.ShipCity, Orders.ShipStateOrProvince, Orders.ShipPostalCode, Orders.Total, Orders.OrderDate, Customers.Profession
FROM Orders
JOIN Customers
ON Orders.CustomerID = Customers.CustomerID
WHERE Orders.OrderDate BETWEEN '4/3/2010' AND '2/20/2011'
AND Orders.Total > 1

Thanks Again!

Answer 1

Be explicit about the columns you’re selecting, rather than SELECT *, and when you must get a similarly named column from both tables, use an alias.

SELECT
  Orders.OrderID,
  /* alias example, not that you'd need both CustomerID columns */
  Orders.CustomerID AS oCustomerID,
  Customer.CustomerID AS cCustomerID,
  Customers.Name,
  Customers.Address,
  ....
  ....
FROM [Orders]
JOIN [Customers]
ON [Orders].[CustomerID] = [Customers].[CustomerID]
WHERE [Orders].[OrderDate] BETWEEN '2010/1/1' AND '2011/1/1'
AND [Orders].[Total] > 1