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Improve Query Performance

I have a a Excel 2007 spreadsheet that using SQL queries from an Oracle database. I then use MS Access 2007 linked tables to retrive data from this workbook and to create further queries. I then use Crystal Reports 8 to report on the Access database using a simpe filter and sub reports. As you would imagine this query is quite slow.

What is the best method\ syntax to add indexes to either or both the Excel spreadsheet and MS Access database to improve performance. I do not have update capability on the Oracle database.
3 Solutions
"As you would imagine this query is quite slow. "

Which query are you referring to?

Subreports in crystal can be slow in some cases.
JayceWAuthor Commented:
I am referring to the Crystal report.

As you say I appreciate that they can be slow. This one however takes over 3 hours to complete so I am looking at potential ways to accelerate the query at the Worksheet\ MS Access database level.

Can you post the sql being used by crystal .
(Database> show sql query)
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Rory ArchibaldCommented:
Why does Excel need to be involved in this process?
Can you use Crystal directly against the Oracle database?

JayceWAuthor Commented:
An Error in my joni criteria solved the issue but the comments were useful
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