알고리즘/SQL
- datetime -> date (date_format함수) 2019.11.17
- When then절 2019.11.17
- join 2019.11.16
- IFNULL 2019.11.16
- 날짜,시간 관련 함수 2019.11.15
- group by 2019.11.15
- distinct 중복제거 2019.11.15
- count,avg,sum 집계함수 2019.11.15
- 최대,최소 2019.11.15
- Limit 2019.11.15
- where절 2019.11.15
- 정렬(Order by) 2019.11.15