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Mysql时间加减函数为date_add（）、date_sub（）定义和用法DATE_ADD() 函数向日期添加指定的时间间隔。DATE_SUB() 函数向日期减少指定的时间间隔。语法DATE_ADD(date,INTERVAL expr type)DATE_SUB(date,INTERVAL expr type)date 参数是合法的日期表达式。expr参数是您希望添加的时间间隔。type 参数可以是下列值：MICROSECONDSECONDMINUTEHOURDAYWEEK

问题截图：忘记登入密码，直接进入mysql中使用update修改用户密码出现问题修改mysql中的root账户密码出现ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘(“root”) where user=“root”’ at line 1

select * from (--转化成周一去重select distinct trunc(t.day,'iw') as mon from (--获取本月所有日期集合SELECT trunc(sysdate, 'mm') + LEVEL - 1 DAYFROM DUALCONNECT BY trunc(sysdate, 'mm') + LEVEL - 1 <=la...

--取本周时间内的数据select * from table where DTIME >=trunc(next_day(sysdate-8,1)+1) and DTIME<=trunc(next_day(sysdate-8,1)+7)+1 ; --国外的select * from table where DTIME >=trunc(next_day(sysdate-8...

其代码：select * from(SELECT rownum as rn, a.* FROM (select count(rdr_Id),rdr_id from RDRPARTACTIV_LOG p group by rdr_Id ORDER BY count(rdr_Id) desc) a where rownum<=20)where rn>0