Можно ли сводить и агрегировать по двум столбцам с помощью запроса Sql PIVOT?

Question

Можно ли сводить два столбца в сводном запросе.

Предположим, у меня есть следующие данные ...

CREATE TABLE JudgeScores 
    (PerformanceID int, 
    JudgeID int, 
    Criteria varchar(10), 
    StrengthScore decimal(9,4), 
    StyleScore decimal(9,4))

--first team performance
--judge1
INSERT INTO JudgeScores (1, 1, "Stunts",        4.2, 1.1)
INSERT INTO JudgeScores (1, 1, "Jumps",         3.9, 0.8)
INSERT INTO JudgeScores (1, 1, "Tumbling",      4.5, 1.0)
INSERT INTO JudgeScores (1, 1, "Choreography",  4.2, 1.5)
--judge2
INSERT INTO JudgeScores (1, 2, "Stunts",        4.1, 1.1)
INSERT INTO JudgeScores (1, 2, "Jumps",         4.0, 0.9)
INSERT INTO JudgeScores (1, 2, "Tumbling",      4.4, 1.1)
INSERT INTO JudgeScores (1, 2, "Choreography",  4.2, 1.6)

--judge3
INSERT INTO JudgeScores (1, 3, "Stunts",        3.8, 1.2)
INSERT INTO JudgeScores (1, 3, "Jumps",         4.2, 0.7)
INSERT INTO JudgeScores (1, 3, "Tumbling",      4.3, 1.2)
INSERT INTO JudgeScores (1, 3, "Choreography",  4.1, 1.3)


--second team performance
--judge1
INSERT INTO JudgeScores (2, 1, "Stunts",        4.3, 1.3)
INSERT INTO JudgeScores (2, 1, "Jumps",         4.0, 0.9)
INSERT INTO JudgeScores (2, 1, "Tumbling",      4.6, 1.1)
INSERT INTO JudgeScores (2, 1, "Choreography",  4.0, 1.0)
--judge2
INSERT INTO JudgeScores (2, 2, "Stunts",        4.1, 1.1)
INSERT INTO JudgeScores (2, 2, "Jumps",         4.0, 0.9)
INSERT INTO JudgeScores (2, 2, "Tumbling",      4.5, 1.2)
INSERT INTO JudgeScores (2, 2, "Choreography",  4.2, 1.6)

--judge3
INSERT INTO JudgeScores (2, 3, "Stunts",        4.1, 1.1)
INSERT INTO JudgeScores (2, 3, "Jumps",         4.5, 0.9)
INSERT INTO JudgeScores (2, 3, "Tumbling",      4.4, 1.2)
INSERT INTO JudgeScores (2, 3, "Choreography",  4.2, 1.6)

Я хочу выбрать данные таким образом, чтобы они вращались следующим образом

PerformanceID, JudgeID, StuntsStrength, StuntsStyle, JumpsStrength, JumpsStyle, TumbleStrength, TumbleStyle, ChorStrength, ChorStyle
1     1     4.2,    1.1,    3.9,    0.8,   4.5,   1.0,    4.2,     1.5
1     2     4.1,    1.1,    4.0,    0.9,   4.4,   1.1,    4.2,     1.6
...
2     1     4.3,    1.3,    4.0,    0.9,   4.6,   1.1,    4.0,    1.0
2     2     4.1,    1.1,    4.0,    0.9,   4.5,   1.2,    4.2,    1.6
2     3     ...

Можно ли это сделать с помощью сводного запроса. Если нет, то каков наилучший способ сделать это?

Answer 1

IMO это более читабельно, чем сводный эквивалент.

Сохраняйте простоту и удобство обслуживания:

 select PerformanceId,
        JudgeId,
        [StuntsStrength] = avg(case when Criteria = 'Stunts' then StrengthScore else null end),
        [StuntsStyle] = avg(case when Criteria = 'Stunts' then StyleScore else null end),
        [JumpsStrength] = avg(case when Criteria = 'Jumps' then StrengthScore else null end),
        [JumpsStyle] = avg(case when Criteria = 'Jumps' then StyleScore else null end),
        [TumbleStrength] = avg(case when Criteria = 'Tumbling' then StrengthScore else null end),
        [TumbleStyle] = avg(case when Criteria = 'Tumbling' then StyleScore else null end),
        [ChorStrength] = avg(case when Criteria = 'Choreography' then StrengthScore else null end),
        [ChorStyle] = avg(case when Criteria = 'Choreography' then StyleScore else null end)
from    dbo.JudgeScores
group
by      PerformanceId, JudgeId;

Answer 2

Для выполнения этого запроса вам не нужно быть таким модным, как динамический sql или оператор pivot.

SELECT j.PerformanceID, j.JudgeID, 
    StuntsStrengthScore = (SELECT StrengthScore FROM JudgeScores WHERE PerformanceID = j.PerformanceID and JudgeID = j.JudgeID and Criteria = 'Stunts'),
    StuntsStyleScore = (SELECT StyleScore FROM JudgeScores WHERE PerformanceID = j.PerformanceID and JudgeID = j.JudgeID and Criteria = 'Stunts'),
    JumpsStrengthScore = (SELECT StrengthScore FROM JudgeScores WHERE PerformanceID = j.PerformanceID and JudgeID = j.JudgeID and Criteria = 'Jumps'),
    JumpsStyleScore = (SELECT StyleScore FROM JudgeScores WHERE PerformanceID = j.PerformanceID and JudgeID = j.JudgeID and Criteria = 'Jumps'),
    TumblingStrengthScore = (SELECT StrengthScore FROM JudgeScores WHERE PerformanceID = j.PerformanceID and JudgeID = j.JudgeID and Criteria = 'Tumbling'),
    TumblingStyleScore = (SELECT StyleScore FROM JudgeScores WHERE PerformanceID = j.PerformanceID and JudgeID = j.JudgeID and Criteria = 'Tumbling'),
    ChoreographyStrengthScore = (SELECT StrengthScore FROM JudgeScores WHERE PerformanceID = j.PerformanceID and JudgeID = j.JudgeID and Criteria = 'Choreography'),
    ChoreographyStyleScore = (SELECT StyleScore FROM JudgeScores WHERE PerformanceID = j.PerformanceID and JudgeID = j.JudgeID and Criteria = 'Choreography')
FROM JudgeScores j
ORDER BY PerformanceID, JudgeID