[SQL문제풀기] 레스토랑의 일일 평균 매출액 계산하기

문제

solvesql.com

https://solvesql.com/problems/sales-summary/

SQLite

내가 작성한 정답

select round(avg(tb),2) avg_sales
from (select day,sum(total_bill) tb
      from tips
      group by day);