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Query Criteria in MS Access

Posted on 2007-03-26
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Last Modified: 2013-11-25
I have a text box that I am entering an end value into, say 15.

I am using this text box in a query as criteria - = Forms![frmReports]![txtEndCriteria].

I would like to return all values that are less than 15 - the value I enter into the text box.

One problem.  The field in the query that I am using for criteria is a text field (which I can't change).  This not allowing me to return the proper values.  It seems to view 999 as 9 and 199 as 1 - therefore my query is returning the wrong values.

Any suggestions?
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Question by:jamesdean666
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LVL 9

Expert Comment

by:TheSloath
ID: 18797165
In the Query Rather than having the WHERE clause directly on the text field, e.g.:

[txtNumber] < Forms![frmReports]![txtEndCriteria]

...change it into a number first, e.g.:

CDbl([txtNumber]) < Forms![frmReports]![txtEndCriteria]
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LVL 9

Expert Comment

by:TheSloath
ID: 18797183
The reason this is happening is because computers compare numbers and text differently.

The computer doesn't care how many letters are in the text, it literally compares 2 words letter by letter starting at the beginning, until one, e.g. to a computer:

"d" > "aaaaaa"    Even though "aaaaaa" has more letters, "d" is higher than "a" and 'wins' immediately.

...so in your example:

"2","3","4","5","6","7","8","9" are all larger than "15" because "15" begins with a 1...
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LVL 75
ID: 18797199

Change your query field (or add this expression) to:
CInt([YourQueryFieldName])

And your criteria expression for the above to:

<=CInt(Forms![frmReports]![txtEndCriteria])

If you are entering non-integers in the text box, then use CSng instead of CInt

mx
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Author Comment

by:jamesdean666
ID: 18797232
None working....
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LVL 9

Expert Comment

by:TheSloath
ID: 18797247
Can you post the SQL you are running?
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Author Comment

by:jamesdean666
ID: 18797258
SELECT tlkpClinic.Clinic, QRY_DOH_SummaryDiabetes.pcp, QRY_DOH_SummaryDiabetes.chart_number, tblDemo.[last_name] & ", " & [first_name] AS FullName, tblDemo.phone1, tblDemo.address1, tblDemo.address2, tblDemo.city, tblDemo.state, tblDemo.zip, QRY_DOH_AllDiabetesInclA1CTests.last_result, QRY_DOH_SummaryDiabetes.clinic_code
FROM ((QRY_DOH_SummaryDiabetes INNER JOIN tblDemo ON (QRY_DOH_SummaryDiabetes.chart_number = tblDemo.chart_number) AND (QRY_DOH_SummaryDiabetes.clinic_code = tblDemo.clinic_code)) INNER JOIN tlkpClinic ON QRY_DOH_SummaryDiabetes.clinic_code = tlkpClinic.Clinic_code) LEFT JOIN QRY_DOH_AllDiabetesInclA1CTests ON (QRY_DOH_SummaryDiabetes.clinic_code = QRY_DOH_AllDiabetesInclA1CTests.clinic_code) AND (QRY_DOH_SummaryDiabetes.chart_number = QRY_DOH_AllDiabetesInclA1CTests.chart_number)
WHERE (((QRY_DOH_SummaryDiabetes.clinic_code)<=CDbl([Forms]![frmReports]![txtEndCriteria])))
ORDER BY CSng(nz([last_result],999));
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Accepted Solution

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TheSloath earned 500 total points
ID: 18797262
You need a CDblon the QRY_DOH_SummaryDiabetes.clinic_code, as it is a text field:


WHERE ((CDbl(QRY_DOH_SummaryDiabetes.clinic_code)<=CDbl([Forms]![frmReports]![txtEndCriteria])))
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LVL 9

Expert Comment

by:TheSloath
ID: 18797285
Just a side note: if there was an index on QRY_DOH_SummaryDiabetes.clinic_code, by performing a conversion on it in the WHERE clause you would loose the benifit of the index. If there was a large amount of data and this caused a performance hit, it would better to store the clinic_code with leading zeros, so 9 could be 00009 and 234 could be 00234 for example, then you could have the following WHERE clause, keeping the benifit of the index:


WHERE (((QRY_DOH_SummaryDiabetes.clinic_code)<=Format([Forms]![frmReports]![txtEndCriteria], "00000")))
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Author Comment

by:jamesdean666
ID: 18797289
Rock and Roll oh mighty Sloath...

and many thanks!

JD
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LVL 75
ID: 18797517
Basically what I said, lol ...
"Change your query field (or add this expression) to:
CInt([YourQueryFieldName])"

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