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Get mean value of related fields


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Hi,

I have a table called "sequence" with records of the sort

[color:green]Patient - text

[color:green]Time - number

[color:green]Sample - text

[color:green]SeqLength - number

In Sequences, there are often several entries that share the same [color:green]Patient, [color:green]Sample and [color:green]Time values.

I have a related table "Visits" that has a single record for every unique Patient/Time /Sample combination (ie a many-to-one from Sequences to Visits). In Visits, I would like to have a field [color:red]AveSeqLength that is the mean of all of the [color:green]SeqLength entries from matching records in Sequences. Does anyone have any idea of how to do this?

Many thanks,

Marcel

(I originally posted this as a multi-part problem in the database schema forum, but since then have solved the database part of it)

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