Operations wants to know how many visits were either cancelled or marked as no-shows. Return a single count of visits whose status is 'cancelled' or 'no_show'.
Schema
🔑idINT
🔗patient_idINT
🔗doctor_idINT
visit_dateTEXT
diagnosisTEXT
notesTEXTNULL
follow_up_dateTEXTNULL
statusTEXT
postgresql
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