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SQL Question for Inner join

Select * from OrderDetails inner join Products on Products.ProductID = OrderDetails.ProductID inner join Discounts on OrderDetails.DiscountID = Discounts.DiscountID where OrderID = 213

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I'm trying to pull all the OrderDetails records where OrderID = 213.
Some OrderDetails records have Discounts (and a Discount ID)
If no discount has been applied to the OrderDetails, the value for DiscountID is Null.

I need to pull OrderDetails for ALL records for OrderID 213 - even those with a NULL value for DiscountID.

I would appreciate any help sorting out this query.  right now it's returning 1 record, it should return 6.

Thanks for your help!!!

Steve
0
slightlyoff
Asked:
slightlyoff
3 Solutions
 
Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
>Some OrderDetails records have Discounts (and a Discount ID)
<Knee-jerk reaction> Change the INNER JOINs to a LEFT JOIN, which will return all OrderDetails rows regardless of whether there is a related Discount row or not.
SELECT *
FROM OrderDetails 
   LEFT JOIN Products on Products.ProductID = OrderDetails.ProductID 
   LEFT JOIN Discounts on OrderDetails.DiscountID = Discounts.DiscountID 
WHERE OrderID = 213

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1
 
Jose TorresSenior SQL Server DBACommented:
I think the LEFT JOIN should only exists between OrderDetails and Discounts
Then again this is assuming that OrderDetails.ProductID has a FK to Products.ProductID, then you may need a LEFT JOIN on both
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Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
^^^ Jose is very likely correct.  Since we can't access this data source and run queries, you'll have to run it yourself and verify.
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Scott PletcherSenior DBACommented:
Select OD.*, P.*, D.*
from dbo.OrderDetails OD
inner join dbo.Products P on P.ProductID = OD.ProductID
left outer join dbo.Discounts D on OD.DiscountID = D.DiscountID
where OD.OrderID = 213
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slightlyoffAuthor Commented:
Thanks for your help - I apologize for the delay in responding.
The SQL I ended up using was:  sql = "SELECT * FROM OrderDetails od full outer join products p on p.ProductID = od.ProductID full outer join Discounts d on od.DiscountID = d.DiscountID WHERE od.OrderID = " & theOrderID
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