如何使用mysql使用月份和日期进行排序

Question

I have a date in this format.

08 april 1989
02 December 1984
13 January 1986 

I would like to sort the results using month and day ,which has column "dateofb" and i sorting is like

13 january 1986
08 april 1989
02 december 1984

I have used the below code which doesn't work fine ,

$sel = $db->query("select * from biography where dateofb >= (CURDATE() - INTERVAL 90 DAY) order by dateofb desc limit 0,3");

I would like to display the 3 sorted results coming 90days.

Answer 1

Is it possible to convert the dateofb column to DATE column type? This would allow you to do what you're looking for. The format you have now is invalid and would need to be converted via STR_TO_DATE(dateofb, '%d %M %Y')

Example:

$sel = $db->query("select * from biography where STR_TO_DATE(dateofb, '%d %M %Y') >= (CURDATE() - INTERVAL 90 DAY) order by STR_TO_DATE(dateofb, '%d %M %Y') desc limit 0,3");

^- See how gross that looks? If your dateofb was a DATE column, you could just do:

$sel = $db->query("select * from biography where dateofb >= (CURDATE() - INTERVAL 90 DAY) order by dateofb desc limit 0,3");

^- which is your original query.

Answer 2

If your "dateofb" field is a DATE or DATETIME:

SELECT 
    *    
FROM biography
WHERE dateofb >= (CURDATE() - INTERVAL 90 DAY)
ORDER BY MONTH(dateofb), DAY(dateofb) ASC
LIMIT 0, 3