SELECT dense_rank()over(partition by road_id ORDER BY len) param,road_id from rs; -- count() over(partition by ... order by ...) SELECT count() over(partition by road_id) param,road_id from rs;
rank() OVER (PARTITION BY depname ORDER BY salary DESC) FROM empsalary; rank函数在当前行的分区内按照ORDER BY子句的顺序为每一个可区分的ORDER BY值产生了一个数字等级。 rank不需要显式的参数,因为它的行为完全决定于OVER子句。 一个窗口函数所考虑的行属于那些通过查询的FROM子句产生并通过WHERE、GROUP B...
select ny, rank() over (partition by ny, gfbm order by zpf desc) as pm from table; select ny, row_number() over (partition by ny, gfbm order by zpf desc) as pm from table; 1. 2. 3. 上面三种方式对应排名如下:
简介:PgSQL——查询某字段每个月的排名 select ny, dense_rank() over (partition by ny, gfbm order by zpf desc) as pm from table;select ny, rank() over (partition by ny, gfbm order by zpf desc) as pm from table;select ny, row_number() over (partition by ny, gfbm order by zpf de...
pg数据库(PostgreSQL)中的排序函数主要用于在查询结果中对数据进行排序。这些函数通常与OVER()子句结合使用,以指定排序的依据和范围。通过排序函数,可以方便地获取数据的排名、分组排序等信息。 2. 常用的pg数据库排序函数 在PostgreSQL中,常用的排序函数包括row_number()、rank()和dense_rank()等。
postgres=#SELECTdepname, empno, salary,rank()OVER(PARTITIONBYdepnameORDERBYsalaryDESC)FROMempsalary; depname|empno|salary|rank---+---+---+---develop|8|6000|1develop|10|5200|2develop|11|5200|2develop|9|4500|4develop|7|4200|5personnel|3|4800|1personnel|2|3900|2personnel|5|3500|3sales...
()over(partitionbyc.source_id,c.wrapper_idorderbyiddesc)asrank_num,*FROMmirror.cpc_ticket c)asaWHEREa.rank_num<=1--修改defaultaltertablemerchantaltercolumncommentsetdefault'';--导出数据表pg_dump-h l-t**ta1.tkt.cn6.***.com-p5432-U pdata-d log_analysis-t wirelessapi_log_2013_09_...
WITH inactive_connections AS ( SELECT pid, rank() over (partition by client_addr order by backend_start ASC) as rank FROM pg_stat_activity WHERE pid <> pg_backend_pid( ) AND application_name !~ '(?:psql)|(?:pgAdmin.+)' AND datname = current_database() AND usename = current_user...
GROUP BY grid_x,grid_y 网格抽稀算法 selectgrid_x,grid_y,name,lon,lat,dense_rankfrom(selectgrid_x,grid_y,name,lon,lat,dense_rank()over(partition by grid_x order by name desc)dense_rankfrom(selectwidth_bucket(st_x(geom),113.635763,127.161163839957,20)grid_x,width_bucket(st_y(geom),17....
4,rank() OVER()与row_number() OVER()类似主要区别是当组内某行字段值相同时,行号重复并且行号产生间隙。 postgres=#SELECTrank()OVER(PARTITIONBYsubjectORDERBYscoreDESC),*FROMscores; rank|id|subject|stu_name|score---+---+---+---+---1|2|Chinese|user2|901|3|Chinese|user3|903|1|Chinese|...