【发布时间】：2021-05-05 21:48:33
【问题描述】：
我正在尝试转换一个数据表——我希望所有的行都成为列，所有的列都成为行，有效地交换它们。我正在使用this answer 的方法来这样做。
如果有什么不同，我正在使用 PHPMyAdmin 在 Raspberry Pi（我的数据很少）上运行我自己的 MariaDB 服务器。
表格（截断）如下所示：
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
我正在尝试将其转换为：
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
我的查询在这里：
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');
运行时出现此错误：
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ') c
) q
GROUP BY Coach
ORDER BY FIELD(Coach, 'Abby', 'Aidan', 'Bran...' at line 60
我真的不知道我的代码在做什么，以及“table t1”交叉连接和“c”和“q”子查询的真正含义，所以我不知道如何修复错误。
附：我在大型“CASE Coach”语句中的新列名使用反引号`，因为其中一个名称必须是 Grant，但这是一个 SQL 关键字。有人告诉我这就是解决这个问题的方法。
【问题讨论】：
-
我刚刚将“table 1 t”更改为“TABLE 2”t，因为这就是我的数据库中调用的表——但是没有解决任何问题。
标签： sql mariadb syntax-error pivot-table transpose