1. 函数向日期添加指定的时间间隔

　DATE_ADD(date,INTERVAL expr type)

　eg:DATE_ADD(CURDATE(),INTERVAL 1 MONTH) //在当前时间加一个月

2.计算年龄

eg:select birth ,CURDATE, YEAR(CURDATE())-YEAR(birth) - (RIGHT(MONTH(CURDATE)，５) < ＲIGHT(MONTH(birth),5)) as age from pet;

birth                  CURDATE         age

1998-09-11       2003-08-19      4

YEAR() 获取年，MONTH() 获取月,day() 获取天

mysql 命令