Mysql 如何按分组方式分隔两列计数？

当我这样做的时候

SELECT id, gender, count(1)
FROM class_student
WHERE id = 1
GROUP BY gender

我明白了

我怎么能得到这个

id female male
---------------
1  10     5

下面的查询是正确的方法吗

SELECT
    id,
    (select count(1) from class_student
     where id = 1 AND gender='female') AS female,
    (select count(1) from class_student
     where id = 1 AND gender='male') AS male
FROM class_student
GROUP BY id

---

您可以在以下情况下使用select with case：

  SELECT id
         , sum(case when gender = 'male' then 1 else 0 end) male, 
         , sum(case when gender = 'female' then 1 else 0 end) female
    FROM class_student
    WHERE id = 1
    GROUP BY id 

---

您可以使用案例：

SELECT id, SUM(case when gender = 'male' then 1 else 0 end) male, SUM(case when gender = 'female' then 1 else 0 end) female
    FROM CLASS_STUDENT
    WHERE id = 1
    GROUP BY id;

---

检查此答案是否应该是

按id分组

？

SELECT id, SUM(case when gender = 'male' then 1 else 0 end) male, SUM(case when gender = 'female' then 1 else 0 end) female
    FROM CLASS_STUDENT
    WHERE id = 1
    GROUP BY id;