Query Averaging Help Needed

Jun 7, 2007

Ok, here's the scoop. I have the following record setup for tracking shipments:

[Shipment_ID_#], [Date_Loaded],[primary_silo], [secondary_silo], [2_silos]

I need to retrieve average values from another table for certain chemistry values based on the [Date_Loaded] and whether or not one or two silos were used when loading the shipment (as indicated by the [2_silos] checkbox).

Scenario #1 - one silo

I need average values of the last four samples based on the [date_Loaded] and the appropriate silo.

Scenario #2 - two silos

I need average values of the last two samples from each silo based on the [date_loaded], [primary_silo], and [secondary_silo].

Would anyone have any thoughts on this? I've tried crosstab and select queries, but I can't get anything to work.

My ultimate goal is to have a form where users select the shipment and the appropriate chemistry averages automatically populate the data fields.

Any help is greatly appreciated.

Thanks,

Greg

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http://i45.photobucket.com/albums/f73/VolcomGrrrl79/access.jpg

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