select row_number() over(partition by name order by name) test from wode; 求解释从wode这张表中取出partition这列根据name进行排序,然后按照结果增加排序列test从1开始顺序往下 相关知识点: 试题来源: 解析 从wode这张表中取出partition这列根据name进行排序,然后按照结果增加排序列test从1开始顺序往下 ...
总结来说,row_number() over (partition by ...)是一个强大的工具,可以用于对查询结果集进行分组和排序,并为每个分组内的行生成唯一的序号。通过调整partition by子句和order by子句,你可以灵活地满足各种查询需求。
a.task_result_id, a.task_result_statusfrom(selectrow_number()over(partitionbytask_idorderbyexecution_timedesc)asidx, res.*fromdg_de_task_result res) awherea.idx=1) bont.task_id=b.task_id
简单的说row_number()从1开始,为每一条分组记录返回一个数字,这里的ROW_NUMBER() OVER (ORDER BY xlh DESC) 是先把xlh列降序,再为降序以后的没条xlh记录返回一个序号。 示例: xlh row_num 1700 1 1500 2 1085 3 710 4 row_number() OVER (PARTITION BY COL1 ORDER BY COL2)表示根据COL1分组,在分...
这就是传说中的开窗函数，以name升序排序，并附上序列
with a as (select *, row_number() over (partition by job order by score desc) t_rank, count(score) over (partition by job) as cnt from grade) select id,job,score,t_rank from a where if(cnt%2=0,t_rank=cnt/2&nbs***bsp;t_rank=cnt/2+1,t_rank=ceil(cnt/2)) order by id...
1 row(s) retrieved. > GBASE南大通用技术分享:GBase 8s CEIL/FLOOR/ ROUND ceil(数量) 楼层(NUM) 四舍五入(数) select ceil(5.6) as f_ceil, floor(5.6)as f_floor, round(5.6) as f_round from dual; > select ceil(5.6) as f_ceil, floor(5.6)as f_floor, round(5.6) as f_round from...
explain SELECT m.*, ROW_NUMBER() OVER (PARTITION BY airline_id, end_date, fleet_id ORDER BY aqi DESC) AS rn FROM pollutant_aggregated_data m WHERE airline_id = 115 AND end_date <= '2022-07-30 14:53:27' AND end_date >= '2020-07-30 14:53:27' ...
select 姓名,row_number() over(partitioned by substr(姓名,1,1) order by 成绩 desc) from thl where substr(姓名,1,1) = 王 limit 10_牛客网_牛客在手,offer不愁
select '20241204'||lpad(row_number()over(partition by '1' order by '1'),10,0) as a from test1; '20241204'||lpad(row_number()over(partition by '1' order by '1'),10,0) 生成值类似日期加序列,是否有更高效率的替代方式?鲁达 帖子 12 回复 181 正在邀请专家答疑,请稍等~ 1楼回复于...