Finance needs to compare average salaries across departments. For each department_id, calculate the average salary. Round to two decimal places and order by average salary descending.
Schema
🔑idINT
first_nameTEXT
last_nameTEXT
specialtyTEXT
🔗department_idINT
emailTEXT
phoneTEXT
hire_dateTEXT
salaryREAL
postgresql
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