Multiplying a column when record does not appear on a separate table

Hello,
I would like to multiple a column by a % unless a corresponding record is located in a separate table.  For example, in the attached database, the query multiplies the entire Item Table by 90%.  I would like for the query to not apply the 90% to Item# 2 since it appears on the Nondiscount Table.  The expected output should appear as below, where all values are multipled by 90% (Expr1) except record 2.

Query1
Item#      Value1             Expr1
1             $60.00              $54
2            $300.00              $300
3            $700.00              $630
4            $900.00           $810
Database-Price2.mdb
Wonderwall99Asked:
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Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
You basically use a Left Join on the NonDiscount table, and then filter for any records which have a NULL value in NonDiscount.Value. The SQL would look like this:

SELECT [Item Table].[Item#], [Item Table].Value1, [Item Table].[Value1]*0.9 AS Expr1, [NonDiscount Table].Value1
FROM [Item Table] LEFT JOIN [NonDiscount Table] ON [Item Table].Value1 = [NonDiscount Table].Value1
WHERE ((([NonDiscount Table].Value1) Is Null));

To test this, open your query, then switch to SQL View. Copy/paste the SQL above into that, then switch back over to Design/Datasheet view.

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Gustav BrockCIOCommented:
You can use this Query:

SELECT
    [Item Table].[Item#],
    [Item Table].Value1,
    CCur(Nz([NonDiscount Table]![Value1],[Item Table]![Value1]*0.9)) AS NewValue
FROM
    [Item Table]
LEFT JOIN
    [NonDiscount Table]
    ON [Item Table].[Item#] = [NonDiscount Table].[Item#];

/gustav
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