Most of the trigger fuctions I've written work on new and updated records
referencing NEW. etc. I will need some of the trigger functions to work with
record deletions too.
First, when a record is being deleted, OLD refers to the rec just deleted
(or about to be deleted)?
Second, while I could write two trigger functions, one dealing with
add/update, the other with deletes, it's probably neater to have a single
trigger function and have it discriminate "am I being called for a delete,
or an add/update?" I don't know how to determine the type record change.
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