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摘自oracle帮助PARTITION BY分组，Order by 分组后按照哪种规则排序事例The following example finds the three highest paid employees in each department inthe hr.employees table. Fewer than three rows are returned for d...

Oracle获取时间日期月份星期数1.日期和字符转换函数用法（to_date,to_char）select to_char(sysdate,‘yyyy-mm-dd hh24:mi:ss’) as nowTime from dual;//日期转化为字符串select to_char(sysdate,‘yyyy’) as nowYear from dual; //获取时间的年select ...