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9.7

Simplifying my select statement

Asked by pmelkebeke in SQL Query Syntax, Databases Miscellaneous, Microsoft Access Database

Tags: MS Acces

I have a query defined which needs to calculate averages for differtent parts of a questionnaire. There are now 1000 records in for testing, but the real db contains over 40000 already.
My sql statement now takes like minutes to load for only those 1000 records.

Does anyone have any tips on simplifying the sql statement.

QuestionnaireOffline contains the results from the query with also CodePostal, the table CodePostal contains the province. I need to get overview of the responses per province.
1:
2:
3:
SELECT DISTINCT (SELECT Count(*) FROM QuestionnaireOffline WHERE CodePostal IN (SELECT CP FROM CodesPostal WHERE Province='BRABANT WALLON')) AS nTotal, (SELECT count(*) FROM QuestionnaireOffline WHERE mode = "Papier" AND CodePostal IN (SELECT CP FROM CodesPostal WHERE Province='BRABANT WALLON')) AS nPapier, (SELECT count(*) FROM QuestionnaireOffline WHERE mode = "Internet" AND CodePostal IN (SELECT CP FROM CodesPostal WHERE Province='BRABANT WALLON')) AS nInternet, ...
 
FROM QuestionnaireOffline;
[+][-]10/24/08 03:44 AM, ID: 22794871Expert Comment

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About this solution

Zones: SQL Query Syntax, Databases Miscellaneous, Microsoft Access Database
Tags: MS Acces
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Solution Provided By: matthewspatrick
Participating Experts: 2
Solution Grade: A
 
 
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