SELECT ROW_NUMBER() OVER (ORDER BY sr.receiptid ASC) AS 序号, sr.receiptid, sr.receiptdate, DATE(sr.receiptdate) AS receiptdate, concat_ws(':',EXTRACT(hour from sr.receiptdate),EXTRACT(minute from sr.receiptdate),EXTRACT(second from sr.receiptdate)) AS
--修改日,从1号修改到10号UPDATE CHECKINOUT SET CHECKTIME=DATEADD(DAY,9,CHECKTIME) WHERE YEAR(CHECKTIME)=1970 and DAY(CHECKTIME)=01--修改小时,从00点修改到6点UPDATE CHECKINOUT SET CHECKTIME=DATEADD(HOUR,6,CHECKTIME) WHERE YEAR(CHECKTIME)=1970 and DAY(CHECKTIME)=10 --修改年,从
高级查询 随机返回5条记录 select * from (select ename,job from emp order by dbms_random.value())where rownum<=5; 处理空值排序 select * from emp order by comm desc nulls last(first); 查询跳过表中的偶数行 select ename from (select row_number() over (order by name) rn,ename from e