本文介绍了根据当前日期对即将到来的生日进行排序的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有下表的人和他们的生日:
I have the following table of people and their birthdays:
name birthday
----------------------
yannis 1979-06-29
natalia 1980-08-19
kostas 1983-10-27
christos 1979-07-22
kosmas 1978-04-28
,我不知道如何根据生日离今天的距离来对名字进行排序.因此,对于NOW()= 2011-09-08,排序结果应为:
and I have no idea how to sort the names on how closer the birthday is to today. So for NOW() = 2011-09-08 the sorted result should be:
kostas 1983-10-27
kosmas 1978-04-28
yannis 1979-06-29
christos 1979-07-22
natalia 1980-08-19
我正在寻找一个快速的技巧,并不真正在意性能(pet项目-表将容纳少于1000条记录),但是当然每个建议都将不胜感激.
I'm looking for a quick hack, don't really care for performance (pet project - table will hold less than 1000 records), but of course every suggestion will be extremely appreciated.
推荐答案
这是一种方法:
- 计算当前年份-出生年份
- 将得出的年数加到出生日期
- 您现在是今年的生日,如果这个日期过去了,再增加一年
- 在该日期之前对结果进行排序
- Calculate current year - year of birth
- Add the resulting number of years to the date of birth
- You now have the birthday this year, if this date has passed then add one more year
- Sort the results by that date
SELECT
name,
birthday,
birthday + INTERVAL (YEAR(CURRENT_DATE) - YEAR(birthday)) YEAR AS currbirthday,
birthday + INTERVAL (YEAR(CURRENT_DATE) - YEAR(birthday)) + 1 YEAR AS nextbirthday
FROM birthdays
ORDER BY CASE
WHEN currbirthday >= CURRENT_DATE THEN currbirthday
ELSE nextbirthday
END
注意:
- 无论当前时间如何,今天的生日都会首先出现
- 2月29日的生日与普通年的2月28日的生日相同,例如
- 在2019年1月1日对2月28日和2月29日生日(2019年)进行了相等的排序
- 在2019年3月1日的2月28日和2月29日生日(2020年)按预期排序
- Today's birthdays appears first regardless of current time
- February 29 birthday is treated equal to February 28 birthday for common years e.g.
- On Jan/1/2019 both Feb 28 and Feb 29 birthdays (2019) are sorted equal
- On Mar/1/2019 Feb 28 and Feb 29 birthdays (2020) are sorted as expected
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