如果您的算法取决于该人的出生年份,则显然存在问题.要解决此问题,首先在当前日期之后找到每个人的下一个生日,然后计算该日期与现在之间的差异.
SELECT u_birth, DATEDIFF(next_birthday, NOW()) AS distance FROM ( #计算下次生日距离当前时间相差多少天
SELECT *, ADDDATE(birthday, INTERVAL birthday < DATE(NOW()) YEAR) AS next_birthday #计算下次生日日期
FROM (
SELECT *, ADDDATE(u_birth, INTERVAL YEAR(NOW()) - YEAR(u_birth) YEAR) AS birthday #计算今年生日日期
FROM blog_users
WHERE s_agehide = 0
) AS T1
) AS T2
ORDER BY distance ASC
LIMIT 5
结果：
'1992-02-29', 20
'1993-03-01', 21
'1987-05-15', 96
'1988-05-15', 96
'1988-09-18', 222
测试数据：
CREATE TABLE blog_users (u_birth NVARCHAR(100) NOT NULL, s_agehide INT NOT NULL);
INSERT INTO blog_users (u_birth, s_agehide) VALUES
('1987-05-15', 0),
('1988-05-15', 0),
('1988-09-20', 0),
('2000-01-02', 0),
('2000-01-03', 1),
('1988-09-19', 0),
('1988-09-18', 0),
('1992-02-29', 0),
('1993-03-01', 0);
请注意,假设在闰日出生的人在非闰年有2月28日的生日.
