Question

Can you pivot two columns in a pivot query.

Suppose I have the following data…

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)

I want to select the data so that it will pivot this data as follows

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     ...

Can this be done with a pivot query. If not what is the best way to do it?

Answer 1

IMO this is more readable than the pivot equivalent.

Keep it simple and maintainable:

 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;