MYSQL将一列中的两个不同值拆分为两列

我试图进行一个查询，根据id将“Y”和“N”的两个值拆分为两个不同的列，并计算它们在每个id中出现的总次数

SELECT exerciseId, count(frustrated) Frustrated from selfreportfrustration where frustrated = 'Y' group by exerciseId;

SELECT exerciseId, count(frustrated) NotFrustrated from selfreportfrustration where frustrated = 'N' group by exerciseId;

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到目前为止，我只对每个值进行了一次查询，但我希望能够将其缩短为一次查询，以便我的程序正常运行。

我们将在另一列中添加“Y”或“N”：

SELECT frustrated, exerciseId,
  count(frustrated) Frustrated
from selfreportfrustration
group by frustrated, exerciseId;

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我们将在另一列中添加“Y”或“N”：

SELECT frustrated, exerciseId,
  count(frustrated) Frustrated
from selfreportfrustration
group by frustrated, exerciseId;

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您可以使用条件聚合：

select exerciseId, sum(frustrated = 'Y') as Frustrated,
       sum(frustrated = 'N') as NotFrustrated
from selfreportfrustration
group by exerciseId;

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您可以使用条件聚合：

select exerciseId, sum(frustrated = 'Y') as Frustrated,
       sum(frustrated = 'N') as NotFrustrated
from selfreportfrustration
group by exerciseId;

可以将聚合与条件函数一起使用

尝试：

可以将聚合与条件函数一起使用

尝试：

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您可以在两个查询之间使用union您可以在两个查询之间使用union