MySQL按年月日计算年龄
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【中文标题】MySQL按年月日计算年龄【英文标题】:MySQL Calculate age by year month and day 【发布时间】:2014-09-03 08:47:44 【问题描述】:我想显示患者年龄的数据。
mysql> 从 sampelaja 中选择 nama,gender,dob,TIMESTAMPDIFF(YEAR,dob,now()) 作为年龄; +-----------------+--------+------------+------+ |名 |性别 |出生日期 |年龄 | +-----------------+--------+------------+------+ |里兹基扬迪 | 1 | 2010-05-21 | 4 | |西蒂霍迪亚 | 0 | 1980-03-15 | 34 | | Aisyah Az-zahra | 0 | 1986-08-17 | 28 | |参数 | 0 | 2005-12-13 | 8 | |恩加迪明 | 1 | 2014-08-28 | 0 | +-----------------+--------+------------+------+ 10 行一组(0.00 秒)这里有一个问题,当有一个4天大的婴儿被视为0岁时 我想要这样的结果
+-----------------+--------+------------+------+- ------+------+ |名 |性别 |出生日期 |年份 |月 |天 | +-----------------+--------+------------+------+- ------+------+ |里兹基扬迪 | 1 | 2010-05-21 | 4 | 3 | 13 | |西蒂霍迪亚 | 0 | 1980-03-15 | 34 | 5 | 18 | | Aisyah Az-zahra | 0 | 1986-08-17 | 28 | 0 | 16 | |参数 | 0 | 2005-12-13 | 8 | 8 | 20 | |恩加迪明 | 1 | 2014-08-28 | 0 | 0 | 6 | +-----------------+--------+------------+------+- ------+------+【问题讨论】:
检查这个可能对你有帮助forums.mysql.com/read.php?10,378024,378912 您可以得到 TIMESTAMPDIFF(DAY) 然后除以 365 表示年份,余数大于 30 然后除以 30(平均月数),其余为天数。或 TIMESTAMPDIFF(YEAR) 和 MONTH AND DAY 的组合,然后按 YEAR * 12 和 DAY 按 YEAR * 365 AND MONTH * 30 的值减去月份 或查看此处了解其他一些方法。 ***.com/questions/18756546/… 如果结果是这样,我想如何显示年龄小于30天的患者的数据? 【参考方案1】:您可以使用模数来确定月数和天数:
SELECT
nama
, gender
, dob
, TIMESTAMPDIFF( YEAR, dob, now() ) as _year
, TIMESTAMPDIFF( MONTH, dob, now() ) % 12 as _month
, FLOOR( TIMESTAMPDIFF( DAY, dob, now() ) % 30.4375 ) as _day
FROM
sampelaja
结果是:
+-----------------+--------+------------+-------+--------+------+
| nama | gender | dob | _year | _month | _day |
+-----------------+--------+------------+-------+--------+------+
| Rizkiyandi | 1 | 2010-05-21 | 4 | 3 | 13 |
| Siti Khodijah | 0 | 1980-03-15 | 34 | 5 | 19 |
| Aisyah Az-zahra | 0 | 1986-08-17 | 28 | 0 | 17 |
| Paritem | 0 | 2005-12-13 | 8 | 8 | 20 |
| Ngadimin | 1 | 2014-08-28 | 0 | 0 | 6 |
+-----------------+--------+------------+-------+--------+------+
从上个月的生日日期到今天的天数。
数字30.4375
我使用这个公式计算:[DAYS IN YEAR]/12,其中[DAYS IN YEAR] = 365.25
【讨论】:
谢谢兄弟。这个查询是否可以用作表视图?因为如果患者超过 10 天,我想制定一个标准 可以,可以添加WHERE
子句过滤10年以内的记录:WHERE TIMESTAMPDIFF( YEAR, dob, now() ) < 10
。或者你可以创建CHECK CONSTRAINT
。
一个测试用例是dob='2018-02-15 00:00:00', now='2018-04-17 00:00:00', 你的查询返回0年2月0天,这是不正确的,你能帮我解决这个问题吗@Nicolai
@MajbahHabib,你们的日期之间有 61 天。因为我使用了近似值(1 个月是 30.4375 天),所以查询返回 0.1250
天。函数FLOOR
将此值四舍五入为零。您可能更愿意将这部分的一天算作一整天。为了使这个使用函数CEIL
而不是FLOOR
。希望这会有所帮助。【参考方案2】:
您应该能够使用下面的查询来计算它。该查询计算确切的年、月和日。
这个信息也可以在mysql日期计算页面找到:http://dev.mysql.com/doc/refman/5.0/en/date-calculations.html
SELECT
nama,
gender,
dob,
/* Select the number of years */
TIMESTAMPDIFF(
YEAR,
dob,
CURDATE()
) AS years,
/* Select the number of months by adding the number of years to the 'dob' date field */
TIMESTAMPDIFF(
MONTH,
DATE_ADD(
dob ,
INTERVAL TIMESTAMPDIFF(YEAR,dob,CURDATE()) YEAR
),
CURDATE()
) AS months,
/* Select the number of days by adding the number of years and number of months to the 'dob' field */
TIMESTAMPDIFF(
DAY,
DATE_ADD(
DATE_ADD(
dob ,
INTERVAL TIMESTAMPDIFF(YEAR,dob,CURDATE()
) YEAR),
INTERVAL TIMESTAMPDIFF(
MONTH,
DATE_ADD(
dob ,
INTERVAL TIMESTAMPDIFF(YEAR,dob,CURDATE()) YEAR
),
CURDATE()
) MONTH
),
CURDATE()
) AS days
FROM
sampelaja
【讨论】:
谢谢兄弟。你回答正确。但是太长了。它是否可以用作表格视图?我想选择一个答案但不能,必须选择一个合适的答案:-(【参考方案3】:已接受答案中的问题
接受答案中的方法很好,但闰年在生日时会搞砸。以下是一些测试用例:
create table sample (dob datetime,now datetime);
insert into sample (dob,now)values
('2012-02-29', '2013-02-28'),
('2012-02-29', '2016-02-28'),
('2012-02-29', '2016-03-31'),
('2012-01-30', '2016-02-29'),
('2012-01-30', '2016-03-01'),
('2011-12-30', '2016-02-29');
SELECT
date_format(dob,'%Y-%m-%d')
, date_format(now,'%Y-%m-%d')
, TIMESTAMPDIFF( YEAR, dob, now ) as _year
, TIMESTAMPDIFF( MONTH, dob, now ) % 12 as _month
, FLOOR( TIMESTAMPDIFF( DAY, dob, now ) % 30.4375 ) as _day
FROM sample
DOB NOW YEAR MONTH DAY
2012-02-29 2013-02-28 0 11 30 -- 28 days would be better
2012-02-29 2016-02-28 3 11 29 -- 28 days would be better
2012-02-29 2016-03-31 4 1 0 -- 2 days would be better
2012-01-30 2016-02-29 4 0 30
2012-01-30 2016-03-01 4 1 0 -- 2 days should be right
2011-12-30 2016-02-29 4 1 0 -- The right answer should be 4 years 1 months 30 days
这是我的方法,只使用算术
select
DATE_FORMAT(dob,'%Y-%m-%d'),
DATE_FORMAT(now,'%Y-%m-%d'),
FLOOR(( DATE_FORMAT(now,'%Y%m%d') - DATE_FORMAT(dob,'%Y%m%d'))/10000),
FLOOR((1200 + DATE_FORMAT(now,'%m%d') - DATE_FORMAT(dob,'%m%d'))/100) %12,
(sign(day(now) - day(dob))+1)/2 * (day(now) - day(dob)) +
(sign(day(dob) - day(now))+1)/2 * (DAY(STR_TO_DATE(DATE_FORMAT(dob + INTERVAL 1 MONTH,'%Y-%m-01'),'%Y-%m-%d') - INTERVAL 1 DAY)
- day(dob) + day(now))
-- Explain: if the days of now is bigger than the days of birth, then diff the two days
-- else add the days of now and the distance from the date of birth to the end of the birth month
from sample
测试用例和结果:
DOB NOW YEARS MONTHS DAYS
2012-02-29 2013-02-28 0 11 28
2012-02-29 2016-02-28 3 11 28
2012-02-29 2016-03-31 4 1 2
2012-01-30 2016-02-29 4 0 30
2012-01-30 2016-03-01 4 1 2
2011-12-30 2016-02-29 4 1 30
【讨论】:
【参考方案4】:当日期是同一天时,Jaugar Chang 的答案中的天数列会出现故障。我认为以下内容对此进行了纠正:
(SELECT CASE sign(day(now)-day(dob))
WHEN 0 THEN 0
WHEN 1 THEN day(now)-day(dob)
ELSE (DAY(STR_TO_DATE(DATE_FORMAT(dob + INTERVAL 1 MONTH,'%Y-%m-01'),'%Y-%m-%d')-INTERVAL 1 DAY)-day(dob)+day(now)) END)
as days
为了完整起见,Jaugar 答案的修订版本如下:
SELECT
FLOOR(( DATE_FORMAT(NOW(),'%Y%m%d') - DATE_FORMAT(dob,'%Y%m%d'))/10000) as year,
FLOOR((1200 + DATE_FORMAT(NOW(),'%m%d')-DATE_FORMAT(dob,'%m%d'))/100) %12 as month,
CASE sign(day(NOW())-day(dob))
WHEN 0 THEN 0
WHEN 1 THEN day(NOW())-day(dob)
ELSE (DAY(STR_TO_DATE(DATE_FORMAT(dob + INTERVAL 1 MONTH,'%Y-%m-01'),'%Y-%m-%d')-INTERVAL 1 DAY)-day(dob)+day(NOW())) END as day
FROM sampelaja
【讨论】:
【参考方案5】:这是我用来计算年龄的查询,以年、月和日为单位
SELECT nama, gender, dob
,DATE_FORMAT(CURDATE(), '%Y') - DATE_FORMAT(dob, '%Y') - (DATE_FORMAT(CURDATE(), '00-%m-%d') < DATE_FORMAT(dob, '00-%m-%d')) AS years
,PERIOD_DIFF( DATE_FORMAT(CURDATE(), '%Y%m') , DATE_FORMAT(dob, '%Y%m') ) AS months
,DATEDIFF(CURDATE(),dob) AS days
FROM sampelaja
【讨论】:
【参考方案6】:下面的函数是从各种资源中复制过来的,合并为一个。 这将以年、月和日的形式返回完整的日期。 也可以修改它以显示任何一个。 此外,current_time 被用作输入,以便我们也可以计算相对于任何其他日期的年龄。
DROP function IF EXISTS `calculate_age`;
DELIMITER $$
CREATE FUNCTION `calculate_age`(`dob` DATE, `current_time` DATETIME)
RETURNS varchar(100) CHARSET utf8
BEGIN
DECLARE years varchar(10);
DECLARE months varchar(9);
DECLARE days varchar(7);
SELECT FLOOR(DATEDIFF(current_time, dob)/365) INTO years;
SELECT FLOOR((DATEDIFF(current_time,dob)/365 - FLOOR(DATEDIFF(current_time,dob)/365))* 12) INTO months;
SELECT CEILING((((DATEDIFF(CURDATE(),dob)/365
- FLOOR(DATEDIFF(CURDATE(),dob)/365))* 12) - FLOOR((DATEDIFF(CURDATE(),dob)/365 - FLOOR(DATEDIFF(CURDATE(),dob)/365))* 12))* 30) into days;
RETURN CONCAT_WS
( ', '
, CASE WHEN years = 0 THEN NULL ELSE CONCAT(years,'y') END
, CASE WHEN months = 0 THEN NULL ELSE CONCAT(months, 'm') END
, CASE WHEN days = 0 THEN NULL ELSE CONCAT(days, 'days') END
);
END$$
DELIMITER ;
【讨论】:
【参考方案7】:SELECT concat(
cast(TIMESTAMPDIFF(YEAR, str_to_date('14/08/2018','%d/%m/%Y'), str_to_date('14/05/2019','%d/%m/%Y')) AS char),' years ',
cast(MOD(TIMESTAMPDIFF(MONTH, str_to_date('14/08/2018','%d/%m/%Y'), str_to_date('14/05/2019','%d/%m/%Y')), 12) as char), ' months ',
cast(DATEDIFF(str_to_date('14/05/2019','%d/%m/%Y'),
DATE_ADD(DATE_ADD(str_to_date('14/08/2018','%d/%m/%Y'), INTERVAL
TIMESTAMPDIFF(YEAR, str_to_date('14/08/2018','%d/%m/%Y'),str_to_date('14/05/2019','%d/%m/%Y'))
YEAR),
INTERVAL MOD(TIMESTAMPDIFF(MONTH, str_to_date('14/08/2018','%d/%m/%Y'),str_to_date('14/05/2019','%d/%m/%Y')),12) MONTH)) AS char),' days') as Age
【讨论】:
【参考方案8】:SELECT TIMESTAMPDIFF(year, dt.dt, NOW()) AS y,
TIMESTAMPDIFF(month, dt.dt, NOW())%12 AS m,
TIMESTAMPDIFF ( day,
DATE_ADD( adddate(curdate(), day( dt.dt) - day(curdate())), interval
-(day( dt.dt)>day(curdate())) month),
curdate()) as days
FROM (select date('1975-08-07') as dt ) as dt;
【讨论】:
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