Grokking the Data Engineering Interview
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Pseudonymization Masking and Access Control

Appointment 7 is a dermatology visit on day 10 for Dana Ruiz, patient 48213, phone 503-555-0147, who lives in Oregon. Three teams at a telehealth company read this row.

Scheduling calls Dana to confirm the visit, so it needs her name and full number. The Oregon support desk checks the last four digits of a caller's phone, so it needs her name but not the whole number. Analytics counts repeat visits, so it must know that appointments 1, 4, and 7 belong to one person, but never which person.

TeamPatient shown asPhone shown asAppointments visible

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