누계와 이동 평균 계산

SQL Server에서의 시계열 분석

Maham Faisal Khan

Senior Data Science Content Developer

누계 계산

Team	Game	RunsScored
AZ	1	8
AZ	2	6
AZ	3	3
FLA	1	7
FLA	2	7
FLA	3	6

Team	Game	RunsScored	TotalRuns
AZ	1	8	8
AZ	2	6	14
AZ	3	3	17
FLA	1	7	7
FLA	2	7	14
FLA	3	6	20

누계(Running total)

SELECT
    s.Team,
    s.Game,
    s.RunsScored,
    SUM(s.RunsScored) OVER (
        PARTITION BY s.Team
        ORDER BY s.Game ASC
        RANGE BETWEEN
              UNBOUNDED PRECEDING
              AND CURRENT ROW
    ) AS TotalRuns
FROM #Scores s;

Team, Game, RunsScored 열
SUM(s.RunsScored)
OVER()
PARTITION BY s.Team
ORDER BY s.Game ASC
RANGE BETWEEN
UNBOUNDED PRECEDING
AND CURRENT ROW

RANGE와 ROWS

`RANGE`

결과의 범위를 지정합니다
동일 값은 한 번에 처리됩니다
UNBOUNDED와 CURRENT ROW만 지원

`ROWS`

포함할 행 수를 지정합니다
동일 값은 행 단위로 처리됩니다
UNBOUNDED, CURRENT ROW, 숫자 지정 지원

이동 평균 계산

SELECT
    s.Team,
    s.Game,
    s.RunsScored,
    AVG(s.RunsScored) OVER (
        PARTITION BY s.Team
        ORDER BY s.Game ASC
        ROWS BETWEEN 1 PRECEDING
            AND CURRENT ROW
    ) AS AvgRuns
FROM #Scores s;

Team	Game	RunsScored	AvgRuns
AZ	1	8	8
AZ	2	6	7
AZ	3	3	4
FLA	1	7	7
FLA	2	7	7
FLA	3	6	6

실습해 봅시다!

SQL Server에서의 시계열 분석