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I haved no idea what you are talking about as far as the patient not seeing something. What the article says since you must not have read it, is that a drug was prescribed that the patient was allergic to.
"<i>She was allergic to sulfa drugs, however, a fact noted in her written record but not on the computer-generated record the resident reviewed before prescribing the drug.</i>"
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If you drop the patient database, you are not removing a row, you dropped the whole database. This is definitely NOT going to return a NULL, its going **** its pants because something is very wrong, theres not even a table to run a query on, or in the case of corruption, I'm not sure what makes you think its likely that the patient record will return correctly except for the allergy row, which is nice and NULL. I have NEVER seen a databse that is corrupted do that.
You have no idea what kind of error handling the front end has (though being a potentially life or death installation it was most likely done in Ada, which has excellent error handling abilities and pretty much never "****(s) its pants")... and to even assume is beond the scope of the example.