Patients in alphabetical order

The registrar is preparing a printed patient directory. Return each patient's first and last name. Sort the list first by last name, then by first name, both in ascending order.

Expected output sample

This is what a correct answer looks like — its row count is its own, it doesn't have to match the schema tables.

last_name	first_name
Brooks	Mary
Carter	Eve
Davis	John

Your query result will appear here

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