可以与 MySQL INTERVAL 关键字一起使用的不同单位值有哪些？
可与 MySQL INTERVAL 关键字一起使用的不同单位值如下 -
MICROSECOND
此单位将用于添加或减去指定的数量从当前时间或用户提供的微秒数。
mysql> Select NOW()+INTERVAL 100 MICROSECOND +--------------------------------+ | NOW()+INTERVAL 100 MICROSECOND | +--------------------------------+ | 2017-10-28 18:47:25.000100 | +--------------------------------+ 1 row in set (0.00 sec)登录后复制
mysql> Select '2017-02-25 05:04:30' + INTERVAL 100 Microsecond; +--------------------------------------------------+ | '2017-02-25 05:04:30' + INTERVAL 100 Microsecond | +--------------------------------------------------+ | 2017-02-25 05:04:30.000100 | +--------------------------------------------------+ 1 row in set (0.00 sec)登录后复制
SECOND
此单位将用于添加或从当前时间或用户提供的时间减去指定的秒数。
mysql> Select NOW()+INTERVAL 59 SECOND; +--------------------------+ | NOW()+INTERVAL 59 SECOND | +--------------------------+ | 2017-10-28 18:49:30 | +--------------------------+ 1 row in set (0.00 sec)登录后复制
mysql> Select '2017-02-25 05:04:30' + INTERVAL 59 Second; +--------------------------------------------+ | '2017-02-25 05:04:30' + INTERVAL 59 Second | +--------------------------------------------+ | 2017-02-25 05:05:29 | +--------------------------------------------+ 1 row in set (0.00 sec)登录后复制
MINUTE
此单位将用于添加或从当前时间或用户提供的时间减去指定的分钟数。
mysql> Select NOW()+INTERVAL 10 MINUTE; +--------------------------+ | NOW()+INTERVAL 10 MINUTE | +--------------------------+ | 2017-10-28 18:58:44 | +--------------------------+ 1 row in set (0.00 sec)登录后复制
mysql> Select '2017-02-25 05:04:30' + INTERVAL 10 Minute; +--------------------------------------------+ | '2017-02-25 05:04:30' + INTERVAL 10 Minute | +--------------------------------------------+ | 2017-02-25 05:14:30 | +--------------------------------------------+ 1 row in set (0.00 sec)登录后复制
HOUR
此单位将用于添加或从当前时间或用户提供的时间减去指定的小时数。
mysql> Select NOW()+INTERVAL 2 HOUR; +-----------------------+ | NOW()+INTERVAL 2 HOUR | +-----------------------+ | 2017-10-28 20:55:44 | +-----------------------+ 1 row in set (0.00 sec)登录后复制
mysql> Select '2017-02-25 05:04:30' + INTERVAL 1 Hour; +-----------------------------------------+ | '2017-02-25 05:04:30' + INTERVAL 1 Hour | +-----------------------------------------+ | 2017-02-25 06:04:30 | +-----------------------------------------+ 1 row in set (0.00 sec)登录后复制
DAY
此单位将用于添加或从当前日期或用户提供的指定天数中减去指定天数。
mysql> Select NOW()+INTERVAL 10 DAY; +-----------------------+ | NOW()+INTERVAL 10 DAY | +-----------------------+ | 2017-11-07 18:48:53 | +-----------------------+ 1 row in set (0.00 sec)登录后复制
mysql> Select '2017-02-25 05:04:30' + INTERVAL 10 Day; +-----------------------------------------+ | '2017-02-25 05:04:30' + INTERVAL 10 Day | +-----------------------------------------+ | 2017-03-07 05:04:30 | +-----------------------------------------+ 1 row in set (0.00 sec)登录后复制
WEEK
此单位将用于添加或从当前日期或用户提供的指定周数中减去指定周数。
mysql> Select NOW()+INTERVAL 1 WEEK; +-----------------------+ | NOW()+INTERVAL 1 WEEK | +-----------------------+ | 2017-11-04 18:49:10 | +-----------------------+ 1 row in set (0.00 sec)登录后复制
mysql> Select '2017-02-25 05:04:30' + INTERVAL 1 Week; +-----------------------------------------+ | '2017-02-25 05:04:30' + INTERVAL 1 Week | +-----------------------------------------+ | 2017-03-04 05:04:30 | +-----------------------------------------+ 1 row in set (0.00 sec)登录后复制
MONTH
将使用此单位用于从当前日期或用户提供的指定月份数中添加或减去指定月份数。
mysql> Select NOW()+INTERVAL 1 MONTH; +------------------------+ | NOW()+INTERVAL 1 MONTH | +------------------------+ | 2017-11-28 18:49:31 | +------------------------+ 1 row in set (0.00 sec)登录后复制
mysql> Select '2017-02-25 05:04:30' + INTERVAL 1 Month; +------------------------------------------+ | '2017-02-25 05:04:30' + INTERVAL 1 Month | +------------------------------------------+ | 2017-03-25 05:04:30 | +------------------------------------------+ 1 row in set (0.00 sec)登录后复制
借助 MySQL INTERVAL 关键字，上述查询将在指定日期和时间上添加 1 个月。
