Postgresql 函式 觸發器寫法

1、資料庫環境

-- table: 學生分數表

create table stu_score
( stuno serial not null, --學生編號
major character varying(16), --專業課程
score integer --分數
)with (
oids=false
);alter table stu_score owner to postgres;
-- table: 專業狀態表，儲存哪個專業有多少學生報名
create table major_stats
( major character varying(16), --專業課程
total_score integer, --總分
total_students integer --學生總數
)with (
oids=false
);alter table major_stats owner to postgres;

create or replace function fun_stu_major()

returns trigger as 
$body$
declare
rec record;
begin
delete from major_stats;--將統計表裡面的舊資料清空
for rec in (select major,sum(score) as total_score,count(*) as total_students 
from stu_score group by major) loop
insert into major_stats values(rec.major,rec.total_score,rec.total_students);
end loop;
return new;
end;
$body$
language 'plpgsql' volatile

create trigger tri_stu_major 

after insert or update or delete
on stu_score 
for each row
execute procedure fun_stu_major()

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