MYSQL：每小时1个重复结果

我正在创建一个“逐小时”报告，显示每小时登录到系统的用户数，我希望这是一个不同的计数

然而，当我运行下面的SQL时，它是在互相添加和附加1，例如，当真实数字为4时12am=5，当真实数字为9时1am=10

我搞不懂为什么会这样。下面有一个链接，显示我的结果是什么样子的，这很好，但是它显示的信息不正确

下面是我的问题

SELECT 
    count(distinct IF(loginDate BETWEEN '2017-02-08 00:00:00' AND '2017-02-08 00:59:59',
       (Userid),
        0)) AS '12am',
    count(distinct IF(loginDate BETWEEN '2017-02-08 01:00:00' AND '2017-02-08 01:59:59',
        (Userid),
        0)) AS '1am',
    count(distinct IF(loginDate BETWEEN '2017-02-08 02:00:00' AND '2017-02-08 02:59:59',
        (Userid),
        0)) AS '2am',
    count(distinct IF(loginDate BETWEEN '2017-02-08 03:00:00' AND '2017-02-08 03:59:59',
        (Userid),
        0)) AS '3am',
    count(distinct IF(loginDate BETWEEN '2017-02-08 04:00:00' AND '2017-02-08 04:59:59',
        (Userid),
        0)) AS '4am',
    count(distinct IF(loginDate BETWEEN '2017-02-08 05:00:00' AND '2017-02-08 05:59:59',
        (Userid),
        0)) AS '5am',
    count(distinct IF(loginDate BETWEEN '2017-02-08 06:00:00' AND '2017-02-08 06:59:59',
        (Userid),
        0)) AS '6am',
    count(distinct IF(loginDate BETWEEN '2017-02-08 07:00:00' AND '2017-02-08 07:59:59',
        (Userid),
        0)) AS '7am',
    count(distinct IF(loginDate BETWEEN '2017-02-08 08:00:00' AND '2017-02-08 08:59:59',
        (Userid),
        0)) AS '8am',
    count(distinct IF(loginDate BETWEEN '2017-02-08 09:00:00' AND '2017-02-08 09:59:59',
        (Userid),
        0)) AS '9am',
    count(distinct IF(loginDate BETWEEN '2017-02-08 10:00:00' AND '2017-02-08 10:59:59',
        (Userid),
        0)) AS '10am',
    count(distinct IF(loginDate BETWEEN '2017-02-08 11:00:00' AND '2017-02-08 11:59:59',
        (Userid),
        0)) AS '11am',
    count(distinct IF(loginDate BETWEEN '2017-02-08 12:00:00' AND '2017-02-08 12:59:59',
        (Userid),
        0)) AS '12pm',
    count(distinct IF(loginDate BETWEEN '2017-02-08 13:00:00' AND '2017-02-08 13:59:59',
        (Userid),
        0)) AS '1pm',
    count(distinct IF(loginDate BETWEEN '2017-02-08 14:00:00' AND '2017-02-08 14:59:59',
        (Userid),
        0)) AS '2pm',
    count(distinct IF(loginDate BETWEEN '2017-02-08 15:00:00' AND '2017-02-08 15:59:59',
        (Userid),
        0)) AS '3pm',
    count(distinct IF(loginDate BETWEEN '2017-02-08 16:00:00' AND '2017-02-08 16:59:59',
        (Userid),
        0)) AS '4pm',
    count(distinct IF(loginDate BETWEEN '2017-02-08 17:00:00' AND '2017-02-08 17:59:59',
        (Userid),
        0)) AS '5pm',
    count(distinct IF(loginDate BETWEEN '2017-02-08 18:00:00' AND '2017-02-08 18:59:59',
        (Userid),
        0)) AS '6pm',
    count(distinct IF(loginDate BETWEEN '2017-02-08 19:00:00' AND '2017-02-08 19:59:59',
        (Userid),
        0)) AS '7pm',
    count(distinct IF(loginDate BETWEEN '2017-02-08 20:00:00' AND '2017-02-08 20:59:59',
        (Userid),
        0)) AS '8pm',
    count(distinct IF(loginDate BETWEEN '2017-02-08 21:00:00' AND '2017-02-08 21:59:59',
        (Userid),
        0)) AS '9pm',
    count(distinct IF(loginDate BETWEEN '2017-02-08 22:00:00' AND '2017-02-08 22:59:59',
        (Userid),
        0)) AS '10pm',
    count(distinct IF(loginDate BETWEEN '2017-02-08 23:00:00' AND '2017-02-08 23:59:59',
        (Userid),
        0)) AS '11pm'
FROM
    mb_useraccessheader

---

这是因为您的

If

状况。您说的是

不同（如果（true，userid，0））

。由于

0

是一个值，因此它被视为

不同的值

解决方案：将其替换为
null