How does a Navision flowfield work so much faster than a SQL sum command?

In Microsoft Dynamics NAV (Navision) a flowfield shows the sum of thousand or millions of lines from other tables almost instantly, but when I try to sum the same data using a SQL Query SUM it takes hours... why?

Thanks

Doug
dougshepardAsked:
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AndersHedegaardCommented:
The flowfield sums are calculated during the insert of records. A separat set of records is maintained with the sums already calculated. The Navision client therefore only has to find a few records whereas SQL SUM has to find and sum all the records.
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AndersHedegaardCommented:
You can actually access the same sums as they are maintained in regular tables. In a Navision SQL database there are a number of tables with only numbers. Those numbers reference table, field and index numbers in Navision. With the help of a Navision developer you can find out which to use.
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dougshepardAuthor Commented:
Nice!  Thanks!

Doug
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