March 2021
Beginner to intermediate
456 pages
12h 49m
Korean
Content preview from 러닝 SQL: 데이터 생성, 검색, 조작까지 데이터 제대로 주무르기
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353
16
장
분석 함수
-> WHERE year(payment_date) = 2005
-> GROUP BY quarter(payment_date), monthname(payment_date);
+---------+----------+---------------+-------------------+----------------+
| quarter | month_nm | monthly_sales | max_overall_sales | max_qrtr_sales |
+---------+----------+---------------+-------------------+----------------+
| 2 | May | 4824.43 | 28373.89 | 9631.88 |
| 2 | June | 9631.88 | 28373.89 | 9631.88 |
| 3 | July | 28373.89 | 28373.89 | 28373.89 |
| 3 | August | 24072.13 | 28373.89 | 28373.89 |
+---------+----------+---------------+-------------------+----------------+
4 rows in set (0.09 sec)
이러한 추가 열을 생성하는 데 사용되는 분석 함수는 행을 두 개의 집합으로 ...