select DATE_FORMAT(NOW(),’%Y-%m-%d %T’) — 日期格式化 2020-06-30 11:03:26
select DATE_FORMAT(NOW(),’%Y-%c’) — 日期格式化 2020-6
select YEAR(NOW()) — 获取年2020
select MONTH(NOW()) –获取月6
select DAY(NOW()) — 获取日30
select DAYNAME(NOW()) –获取星期 Tuesday
select FLOOR(25.96) — 向下取整 25
select UNIX_TIMESTAMP(‘2020-06-30’) — 获取时间戳 1593446400
select FROM_UNIXTIME(UNIX_TIMESTAMP(‘2020-06-30’)) –2020-06-30 00:00:00
select RAND() –随机数 0.3934691337807748
select FLOOR(RAND()*10) –随机数取整 9
select CONCAT(‘zhang’,’-‘,’dong’,’-‘,’ling’) — 字符串拼接zhang-dong-ling
select MOD(89,9) — 取余 8
select DATE(‘2020-06-30 15:52:34’) –获取日期 2020-06-30
