SQL Select statement question

Hello, how can I subtract 23 from sum(tblCountData.Incount) only if the value is greater than 0?

SELECT tblCountData.RecDate, sum(tblCountData.Incount) AS trafficcount
FROM tblCountData
GROUP BY tblCountData.RecDate;
Sean RhudyPresidentAsked:
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case when sum(tblCountData.Incount) > 0 then sum(tblCountData.Incount)- 23 Else sum(tblCountData.Incount) END AS trafficcount
FROM tblCountData
GROUP BY tblCountData.RecDate;

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Sean RhudyPresidentAuthor Commented:
It says: syntax error (missing operator) in query expression
Sean RhudyPresidentAuthor Commented:
I'm using Access 2007
the query that posted for MS sql server, Sorry i can't help you in Access 2007
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Query Syntax

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