KNT thống kê danh sách môn học sinh viên được đăng ký mv1b

6. Bố cục luận văn

3.1.4. KNT thống kê danh sách môn học sinh viên được đăng ký mv1b

a) Mục đích:

- Lập danh sách môn học sinh viên được đăng ký. b) Tạo bảng thể hiện KNT:

create table mv1b(

masv character varying(12), mamh int,

tenmh character varying(30) );

c) Khởi tạo dữ liệu:

insert into mv1b

select sinhvien.masv,monhoc.mamh,monhoc.tenmh

from sinhvien join lop on sinhvien.malop=lop.malop join nganh on lop.mang=nganh.mang

join chuongtrinh on nganh.mang=chuongtrinh.mang join monhoc on monhoc.mamh=chuongtrinh.mamh where lop.kyht=chuongtrinh.kythu union distinct select masv,mamh,tenmh from mv3 where diem<5.5 union distinct select masv,monhoc.mamh,monhoc.tenmh

from mv3 join monhoc on mv3.mamh=monhoc.mhtruoc;

d) Tạo các hàm và trigger:

create function sinhvien_mv1b_insert() returns trigger as 'qlsinhvien.dll', 'sinhvien_mv1b_insert' language c strict; create trigger sinhvien_mv1b_insert after insert on sinhvien for each row execute procedure sinhvien_mv1b_insert() ;

create function sinhvien_mv1b_delete() returns trigger as 'qlsinhvien.dll', 'sinhvien_mv1b_delete' language c strict; create trigger sinhvien_mv1b_delete after delete on sinhvien for each row execute procedure sinhvien_mv1b_delete() ;

create function sinhvien_mv1b_update() returns trigger as 'qlsinhvien.dll', 'sinhvien_mv1b_update' language c strict; create trigger sinhvien_mv1b_update after update on sinhvien for each row execute procedure sinhvien_mv1b_update() ;

create function lop_mv1b_update() returns trigger as 'qlsinhvien.dll', 'lop_mv1b_update' language c strict;

create trigger lop_mv1b_update after update on lop for each row execute procedure lop_mv1b_update() ;

create function nganh_mv1b_update() returns trigger as 'qlsinhvien.dll', 'nganh_mv1b_update' language c strict; create trigger nganh_mv1b_update after update on nganh for each row execute procedure nganh_mv1b_update() ;

create function chuongtrinh_mv1b_insertdelete() returns

language c strict;

create trigger chuongtrinh_mv1b_insert after insert on chuongtrinh for each row execute procedure

chuongtrinh_mv1b_insertdelete() ;

create trigger chuongtrinh_mv1b_delete after delete on chuongtrinh for each row execute procedure

chuongtrinh_mv1b_insertdelete() ;

create function chuongtrinh_mv1b_update() returns trigger as 'qlsinhvien.dll', 'chuongtrinh_mv1b_update' language c strict; create trigger chuongtrinh_mv1b_update after update on

chuongtrinh for each row execute procedure chuongtrinh_mv1b_update() ;

create function monhoc_mv1b_update() returns trigger as 'qlsinhvien.dll', 'monhoc_mv1b_update1' language c strict; create trigger monhoc_mv1b_update after update on monhoc for each row execute procedure monhoc_mv1b_update() ;

create function mv3_mv1b_insertdelete() returns trigger as 'qlsinhvien.dll', 'mv3_mv1b_insertdelete' language c strict; create trigger mv3_mv1b_insert after insert on mv3 for each row execute procedure mv3_mv1b_insertdelete() ;

create trigger mv3_mv1b_delete after delete on mv3 for each row execute procedure mv3_mv1b_insertdelete() ;

create function mv3_mv1b_update() returns trigger as 'qlsinhvien.dll', 'mv3_mv1b_update' language c strict;

create trigger mv3_mv1b_update after update on mv3 for each row execute procedure mv3_mv1b_update() ;