Re: [MS_AccessPros] Query Returning Double Rows

 

Paco-

I'm curious why you do a RIGHT JOIN in the first query.  Are you expecting order detail rows that don't have a matching order row?  If that were to happen, you would get Null in the columns from tblOrder.

As for your second query, you will get multiple rows per part if a part appears more than once in tblOrderDetail for a given order and also appears more than once per purchase order.  Two rows in each will get you 2 * 2 or 4 rows.  You can perhaps avoid that by using SELECT DISTINCT in both queries.

John Viescas, Author

Effective SQL

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http://www.viescas.com/ 

(Paris, France)

On Dec 22, 2016, at 10:39 PM, paco6945@yahoo.com [MS_Access_Professionals] <MS_Access_Professionals@yahoogroups.com> wrote:

I have a main query and a sub query. The sub query returns the correct number of rows, but the main query doubles the number of rows. I know why this is happening, but I don't know how to fix it. The main query returns a set of the rows from the sub query for each row in the main query. Here are the queries (simplified).

Any help would be much appreciated.

Paco

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SUBQUERY: qryPartsReceivedByAccount

SELECT PO, Part, Account

FROM tblOrder RIGHT JOIN tblOrderDetail ON tblOrder.OrderID = tblOrderDetail.OrderID;

MAIN QUERY

SELECT Part, DateTrans, qryPartsReceivedByAccount.Account, qryPartsReceivedByAccount.PO

FROM tblPartLog INNER JOIN qryPartsReceivedByAccount ON (tblPartLog.PONumber = qryPartsReceivedByAccount.PO) AND (tblPartLog.Part = qryPartsReceivedByAccount.Part);

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Posted by: John Viescas <johnv@msn.com>

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