[libreoffice-users] Calculated values in View or Query

I wonder if anyone knows a simple way in Base to calculate a value for
a view and/or query field entry from the contents of other data fields
of a record. (I know this feature from MSAccess)

For example, I would like to extract a text string from a field in each
record and display it in an extra view and/or query field, or multiply
two field values and record the result in an extra field.

If so, how would that be done? 

Cheers 
Harvey

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