I am trying to transform a table of data–I want the rows to become the columns, and the columns to become the rows (like a total complete pivot). I am using the method from this answer to do so.
If it makes any difference, I am running my own SQL server on a Raspberry Pi using PHPMyAdmin.
The table (truncated) looks like this:
Personality|Abby|Aidan|Brandon|Bobby
Agreeabl|93 |65 |74 |68
Compassion |95 |65 |96 |96
Politeness |81 |9 |21 |12
Conscient..|45 |13 |99 |28
I’m trying to transpose it into this:
Coach |Agreeableness|Compassion|Politeness|Conscientiousness
Abby |93 |95 |81 |45
Aidan |65 |96 |9 |13
Brandon|74 |96 |21 |99
Bobby |68 |96 |12 |28
And my query is here:
SELECT Coach,
MAX(CASE WHEN Personality = 'Agreeableness' THEN value END) `Agreeableness`,
MAX(CASE WHEN Personality = 'Compassion' THEN value END) `Compassion`,
MAX(CASE WHEN Personality = 'Politeness' THEN value END) `Politeness`,
MAX(CASE WHEN Personality = 'Conscientiousness' THEN value END) `Conscientiousness`,
MAX(CASE WHEN Personality = 'Industriousness' THEN value END) `Industriousness`,
MAX(CASE WHEN Personality = 'Orderliness' THEN value END) `Orderliness`,
MAX(CASE WHEN Personality = 'Extraversion' THEN value END) `Extraversion`,
MAX(CASE WHEN Personality = 'Enthusiasm' THEN value END) `Enthusiasm`,
MAX(CASE WHEN Personality = 'Assertiveness' THEN value END) `Assertiveness`,
MAX(CASE WHEN Personality = 'Neuroticism' THEN value END) `Neuroticism`,
MAX(CASE WHEN Personality = 'Withdrawal' THEN value END) `Withdrawal`,
MAX(CASE WHEN Personality = 'Volatility' THEN value END) `Volatility`,
MAX(CASE WHEN Personality = 'Openness' THEN value END) `Openness`,
MAX(CASE WHEN Personality = 'Intellect' THEN value END) `Intellect`,
MAX(CASE WHEN Personality = 'Openness (Aspect)' THEN value END) `Openness (Aspect)`
FROM
(
SELECT Personality, Coach,
CASE Coach
WHEN 'Abby' THEN Abby
WHEN 'Aidan' THEN Aidan
WHEN 'Brandon' THEN Brandon
WHEN 'Bobby' THEN Bobby
WHEN 'Carlos' THEN Carlos
WHEN 'Carrie' THEN Carrie
WHEN 'Chassidy' THEN Chassidy
WHEN 'Emily' THEN Emily
WHEN 'Galen' THEN Galen
WHEN 'Gavin' THEN Gavin
**WHEN 'Grant' THEN Grant** #part of interest
WHEN 'Greg' THEN Greg
WHEN 'Jack' THEN Jack
WHEN 'Jenn' THEN Jenn
WHEN 'Noah' THEN Noah
WHEN 'Mae' THEN Mae
WHEN 'Patrick' THEN Patrick
WHEN 'Titus' THEN Titus
END value
FROM table1 t CROSS JOIN
(
SELECT 'Abby' Coach UNION ALL
SELECT 'Aidan' UNION ALL
SELECT 'Brandon' UNION ALL
SELECT 'Bobby' UNION ALL
SELECT 'Carlos' UNION ALL
SELECT 'Carrie' UNION ALL
SELECT 'Chassidy' UNION ALL
SELECT 'Emily' UNION ALL
SELECT 'Galen' UNION ALL
SELECT 'Gavin' UNION ALL
SELECT 'Grant' UNION ALL
SELECT 'Greg' UNION ALL
SELECT 'Jack' UNION ALL
SELECT 'Jenn' UNION ALL
SELECT 'Noah' UNION ALL
SELECT 'Mae' UNION ALL
SELECT 'Patrick' UNION ALL
SELECT 'Titus' UNION ALL
) c
) q
GROUP BY Coach
ORDER BY FIELD(Coach, 'Abby', 'Aidan', 'Brandon', 'Bobby', 'Carlos', 'Carrie', 'Chassidy', 'Emily', 'Galen', 'Gavin', 'Grant', 'Greg', 'Jack', 'Jenn', 'Noah', 'Mae', 'Patrick', 'Titus');
In part of the code I need to write WHEN ‘Grant’ THEN Grant but that second unquoted Grant becomes a keyword and messes with my code. When I put Grant in single quotes it throws me a syntax error further down where I write ‘) c’ but I suspect my little cheat probably has something to do with it. What shall I do?
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Answer
You seem to be suggesting that Grant
is a column name — bad choice, but you are stuck with it. The standard way to escape names is to use double quotes:
WHEN 'Grant' THEN "Grant"
Some databases use backticks or square braces instead:
WHEN 'Grant' THEN `Grant`
WHEN 'Grant' THEN [Grant]