It's not worth the aggravation, trust me. A delete query acts on records, by deleting them. On pages 293-294 Cassel and Palmer mention joins. An analogous statement can be made about left outer joins. On page 304, Cassel and Palmer first discuss the concept of a calculated field, as part of their discussion of expressions.
Calculated fields are an important concept in the management of relational databases.
They are virtual fields, taking up no storage space. The storage space is not needed because the data in calculated fields are entirely dependent on data that are actually stored elsewhere, so that the storage of the calculated values would be a complete waste of space. The computation time required to calculate, on the fly, the entries in a calculated field is trivial, since computers are superb at doing arithmetic. The computations can be easily done by the CPU in slack times during the much slower process of retrieving, from disk-stored tables, data that must be stored and are not calculable. However, in Reports, as Cassel and Palmer explain later, it is possible to sort on more than one field at a time.