sql分組排名

資料庫teradata

--班級科目成績表

create multiset table pd_portal.aaa ,no fallback ,

no before journal,

no after journal,

checksum = default

(banji varchar(40) character set latin casespecific title '班級',

kecheng varchar(40) character set latin casespecific title '科目',     

ceshiren varchar(40) character set latin casespecific title '測試人',      

chengji int title '成績')

--測試資料

insert into pd_portal.aaa values('110','語文','張三',80);

insert into pd_portal.aaa values('110','數學','張三',70);

insert into pd_portal.aaa values('110','英語','張三',60);

insert into pd_portal.aaa values('110','語文','李四',80);

insert into pd_portal.aaa values('110','數學','李四',70);

insert into pd_portal.aaa values('110','英語','李四',60);     

insert into pd_portal.aaa values('110','語文','王五',80);

insert into pd_portal.aaa values('110','數學','王五',70);

insert into pd_portal.aaa values('110','英語','王五',60);

--count sql

select * from pd_portal.aaa a where (select count(*) from pd_portal.aaa b where a.banji=b.banji and b.kecheng=a.kecheng

and a.chengji--sql 分析函式

select a.banji,a.kecheng,a.ceshiren,a.chengji

,rank() over (partition by a.banji,a.kecheng order by a.banji,a.kecheng,a.chengji  desc) as rank_1

from pd_portal.aaa a

qualify rank_1<3

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