Question

我有以下代码来计算从今天起生效的人的出生日期

    SELECT application.applicationLastName, application.applicationFirstName, application.applicationDoB, 
ROUND(DATEDIFF(NOW(), applicationDoB) / 365.2425,1) AS age, application.applicationID, application.applicationAcknowledged, application.applicationContacted, application.applicationDate
FROM application
ORDER BY application.applicationDate ASC

然而，我被要求从本月1日开始计算他们的年龄并尝试过

SELECT application.applicationLastName, application.applicationFirstName, application.applicationDoB, DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()), 0) AS CURMONTH, 
ROUND(DATEDIFF(CURMONTH(), applicationDoB) / 365.2425,1) AS age, application.applicationID, application.applicationAcknowledged, application.applicationContacted, application.applicationDate
FROM application
ORDER BY application.applicationDate ASC

但是我收到以下错误：调用本机函数时参数计数不正确＆＃39; DATEDIFF＆＃39;

Answer 1

您不应该使用CURMONTH()。而是将今天的日期格式化为本月1日。

使用以下查询：

SELECT application.applicationLastName, application.applicationFirstName, application.applicationDoB, DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()), 0) AS CURMONTH, 
ROUND(DATEDIFF(DATE_FORMAT(NOW() ,'%Y-%m-01'), applicationDoB) / 365.2425,1) AS age, application.applicationID, application.applicationAcknowledged, application.applicationContacted, application.applicationDate
FROM application
ORDER BY application.applicationDate ASC

Answer 2

您正在使用： DATEDIFF（CURMONTH（），applicationDoB）

你的代码中的

。但是CURMONTH（）只给你当前日期的月份，而applicationDoB给你一个完整的日期。您需要用对应于完整日期的表达式（当前月份的第1个）替换CURMONTH（）。

计算从当月开始的年龄

2 个答案: