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                隨機數 rand() 連接字符串 concat('中國','打日本') 轉換小寫 lcase('ABC') lower 轉換大寫 upper ucase 去除空格 trim(str) ~~~ curdate()+0 返回20160916 curdate() 2016-09-16 curtime() 21:53:23 now() 2019-07-10 21:52:23日期時間 unix_timestamp(now()) 返回時間戳 1562767275 from_unixtime( 1539659520) 返回 2018-10-16 11:12:00 from_unixtime(1515980716, '%Y-%m-%d %H:%i:%S') 2018-01-15 09:45:16 格式化時間 date_format(now(), '%Y-%m-%d') 2018-01-15 date( now()) 2019-07-10 提取日期 year('2019-7-10') 返回2019 month('2016-04-28') 4 day(now()) 11 返回天 hour('2019-12-6 14:7:50') 14 minute('2019-12-6 14:7:50') 7 second('2019-12-6 14:7:50') 50 last_day('2019-12-6 14:7:50') 2019-12-31 給定日期最后一天 quarter('2016-04-28') 2 季度,1,2,3,4 dayofweek('2019-7-10') 返回4 星期三 -1 weekday('2019-7-10') 返回2 星期三+1 dayofyear('2019-7-10') 返回今天是191天 to_days('2019-12-6 14:7:50') 737764計算日期 d 距離 0000 年 1 月 1 日的天數 from_days(733627) 2008-08-08 同上相反 day(last_day(now())) 返回本月天數 date_add('2019-12-6 14:7:50',INTERVAL 1 day) +1天 date_sub('2019-12-6 14:7:50',INTERVAL 1 day) -1天 timestamp('2008-08-08') 2008-08-08 00:00:00 ~~~ 版本version 聚合函數 avg(col) 平均值 count(*) 記錄數 min(col) max(col)最小 最大值 sum(col)求和
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