MAX(rn)OVERw1ASrn_max, MAX(amount)OVERw1ASamount_max, AVG(amount)OVERw1ASamount_avg, * FROMsample_01_diff WINDOW -- w1 AS (ORDER BY traded_at RANGE '30 minutes' PRECEDING) w1AS(PARTITIONBYcard_numORDERBYtraded_atRANGEBETWEEN'30 minutes'PRECEDINGAND'30 minutes'FOLLOWING) ORDERBY rnASC ...
SELECTfirst_name,last_name,department_id,hire_date,RANK()OVER(PARTITIONBYdepartment_idORDERBYhire_date)FROMemployeesORDERBYdepartment_id;first_name|last_name|department_id|hire_date|rank|---|---|---|---|---|Jennifer|Whalen|10|2003-09-17|1|Michael|Hartstein|20|2004-02-17|1|Pat|Fay|20...
select ename,job,sal, RANK() OVER (PARTITION BY job ORDER BY sal) as rankin, DENSE_RANK() OVER (PARTITION BY job ORDER BY sal) as dense_rank, ROW_NUMBER() OVER (PARTITION BY job ORDER BY sal) as row_rankinfrom emp; 窗口函数的适用范围 使用窗口函数的位置却有非常大的限制。更确切地...
min(language_id) over(partition by country order by level asc) as minLanguageId, avg(language_id) over(partition by country order by level asc) as avgLanguageId, max(language_id) over(partition by country order by level asc) as maxLanguageId from course; 执行结果为: OVER(PARTITION BY.....
partition P1 values ('121080005', '121080006', '121080004', '121080007', '010120') tablespace NRCS_LMS_TBS pctfree 10 initrans 1 maxtrans 255 storage ( initial 8M next 8K minextents 1 maxextents unlimited ), partition P_OTHER values (default) ...
(1)语法:<窗口函数> OVER ([PARTITION BY <列清单>] ORDER BY <排序用列清单>) PARTITION BY:能够设定排序的对象范围 ORDER BY:能够指定按照哪一列、何种顺序排序 (2)Rank函数:排序时,如存在相同位次的记录会跳过之后的位次(1,1,1,4) (3)Dense_rank函数:排序时,如果存在相同位次,不会跳过(1,1,2,3...
OVER ([PARTITION BY <列清单>] ORDER BY <排序用列清单>) over:窗口函数关键字 partition by:对结果集进行分组 order by:设定结果集的分组数据排序 聚合函数:聚合函数(SUM、AVG、COUNT、MAX、MIN) 内置函数:rank、dense_rank、row_number、percent_rank、grouping sets、first_value、last_value、nth_value等专...
SELECTcountry_name,"year",gdp,AVG(gdp)OVER(PARTITIONBYcountry_nameORDERBY"year"DESC),MIN(gdp)OVER(PARTITIONBYcountry_nameORDERBY"year"DESC),MAX(gdp)OVER(PARTITIONBYcountry_nameORDERBY"year"DESC)FROMcountry_gdp_year_finalWHEREcountry_codeIN('CHN','JPN','USA','DEU','CAN','FRA')AND"year"...
) creatorname--$5 请使用绑定变量FROM(SELECT questionid,questioncode,typelevel,creator,createtime,updatetime,status,title,subjectid,grade,term,item,degree,sharerange,defaultscore,paragraphid,orgid,sourceid,studylevelid,editiontypeid,refertimes,clicktimes,labelid,row_number() over(PARTITIONBYquestioncode...
[ PARTITION BY expression [, ...] ] [ ORDER BY expression [ ASC | DESC | USING operator ] [ NULLS { FIRST | LAST } ] [, ...] ] [ frame_clause ] OVER表示窗口函数的关键字。 PARTITON BY属性对查询返回的结果集进行分组,之后窗口函数处理分组的数据。