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Calculations across Related Tables

Question asked by keycoachjohn on May 12, 2009
Latest reply on May 12, 2009 by philmodjunk

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Calculations across Related Tables

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Hi,

I'm slooooowly starting to get the hang of related tables.  One current challenge that I cannot find a solution in the current resources (books, forums etc) involves calculating data found across a one-to-many relationship.  I don't think a summary report will work since the calculation is required in tables used further down in the whole DB. 

 

For example, two tables represent the core of the ER, Table A and B:

Table A- "Log" with Fields: primary key, serial number (a value list with several serial numbers in inventory), and monthly utilization per serial number.  Each record represents a new utilization input per serial number.  This should be the "many" side of the relationship, but how to create a working aggregate utilization field based upon a serial number active in Table B?

 

Table B-"Product Status":  Fields for Foreign key from Table A, Starting hours, Total Hours- a calculated field using "starting hours+ (aggregate utilization)

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