MySQL计数点

Question

我有这个（简化的）运行表，其中每个完成的运行都算作一个点：

| email | finished |
|-------|----------|
|    a  |     1    |
|    a  |     1    |
|    a  |     0    |
|    b  |     1    |
|    c  |     0    |

我有这个

SELECT *, COUNT( * ) AS points 
FROM  `runs` 
WHERE finished IS TRUE
GROUP BY email

结果是：

| email |  points  |
|-------|----------|
|    a  |     2    |
|    b  |     1    |

问题是我还需要有关C的信息，因为C尚未完成运行，所以它具有0分

预期结果：

| email |  points  |
|-------|----------|
|    a  |     2    |
|    b  |     1    |
|    c  |     0    |

Answer 1

删除where条款：

SELECT r.email, SUM( finished IS TRUE ) AS points 
FROM  `runs` r 
GROUP BY email;

是的，您还可以在sum()以下位置删除过滤器：

SELECT r.email, SUM(finished) AS points 
FROM  `runs` r 
GROUP BY email;