Question

我有一个表合作者，其中包含：列：hiring_date和release_date（日期类型）我想计算一年中每月合作者的总数使用hiring_date和release_date

Answer 1

我想你是在问这样的事情但是请在提问时提供更多信息

SELECT COUNT(*) FROM collaborator WHERE hiring_date >= date AND release_date<= date

Answer 2

您可以使用“GROUP BY”。例如，使用hiring_date计算每月协作者的总数：

SELECT MONTH(hiring_date),COUNT(*) FROM `collaborator`
GROUP BY MONTH(hiring_date);

要使用release_date计算一年中每月合作者的总数，请使用：

SELECT MONTH(release_date),COUNT(*) FROM `collaborator `
GROUP BY MONTH(release_date)
WHERE YEAR(release_date) = <year>;

Answer 3

此代码是为了获得2016年每月招聘合作者的数量

   SELECT  
    SUM(IF(month = '1', total, 0)) AS 'Jan',
        SUM(IF(month = '2', total, 0)) AS 'Feb',
        SUM(IF(month = '3', total, 0)) AS 'Mar',
        SUM(IF(month = '4', total, 0)) AS 'Apr',
        SUM(IF(month = '5', total, 0)) AS 'May',
        SUM(IF(month = '6', total, 0)) AS 'Jun',
        SUM(IF(month = '7', total, 0)) AS 'Jul',
        SUM(IF(month = '8', total, 0)) AS 'Aug',
        SUM(IF(month = '9', total, 0)) AS 'Sep',
        SUM(IF(month = '10', total, 0)) AS 'Oct',
        SUM(IF(month = '11', total, 0)) AS 'Nov',
        SUM(IF(month = '12', total, 0)) AS 'Dec'

     FROM (
    SELECT month(DATE_ENTREE) AS month , count(DATE_ENTREE) as total
    FROM collaborateur where YEAR(DATE_ENTREE) =2016
    GROUP BY month(DATE_ENTREE)) as e

此代码是2016年每月发布的数量

SELECT  
SUM(IF(month = '1', total, 0)) AS 'Jan',
    SUM(IF(month = '2', total, 0)) AS 'Feb',
    SUM(IF(month = '3', total, 0)) AS 'Mar',
    SUM(IF(month = '4', total, 0)) AS 'Apr',
    SUM(IF(month = '5', total, 0)) AS 'May',
    SUM(IF(month = '6', total, 0)) AS 'Jun',
    SUM(IF(month = '7', total, 0)) AS 'Jul',
    SUM(IF(month = '8', total, 0)) AS 'Aug',
    SUM(IF(month = '9', total, 0)) AS 'Sep',
    SUM(IF(month = '10', total, 0)) AS 'Oct',
    SUM(IF(month = '11', total, 0)) AS 'Nov',
    SUM(IF(month = '12', total, 0)) AS 'Dec'

 FROM (
SELECT month(DATEE_SORTIE_COLLABORATEUR) AS month , count(DATEE_SORTIE_COLLABORATEUR) as total
FROM collaborateur where YEAR(DATEE_SORTIE_COLLABORATEUR) =2016
GROUP BY month(DATEE_SORTIE_COLLABORATEUR)) as s

我的目标是计算每个月的合作者总数希望这可以帮助你理解我的意思

Mysql查询使用输入日期和外出日期获得每月和每年的计数

3 个答案: