HR wants to know the tenure range of the medical staff. Return the earliest hire_date and the latest hire_date from the doctors table as min_hire_date and max_hire_date.
Schema
🔑idINT
first_nameTEXT
last_nameTEXT
specialtyTEXT
🔗department_idINT
emailTEXT
phoneTEXT
hire_dateTEXT
salaryREAL
postgresql
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