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schema.sql
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schema.sql
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drop table if exists Teachers;
drop table if exists Students;
drop table if exists Courses;
drop table if exists Administrators;
drop table if exists Staff;
drop table if exists Teaches;
drop table if exists Enrollments;
create table Teachers (
ssn integer primary key check (ssn >= 0 and length(ssn) = 9),
firstName text not null,
lastName text not null,
phone integer not null check (phone >= 0 and length(phone) = 10),
gender text not null check (gender = 'm' or gender = 'f'),
dob date not null,
address text not null,
salary integer not null check (salary >= 0 and length(salary) < 6)
);
create table Students (
ssn integer primary key check (ssn >= 0 and length(ssn) = 9),
firstName text not null,
lastName text not null,
gender text not null check (gender = 'm' or gender = 'f'),
dob date not null,
address text not null,
level text not null check (level = 'K' or level = '1' or level = '2' or level = '3' or level = '4' or level = '5'),
gpa real check (gpa >= 0 and gpa <= 4)
);
create table Courses (
courseId integer primary key autoincrement check (courseId >= 0),
name text not null,
level text not null check (level = 'K' or level = '1' or level = '2' or level = '3' or level = '4' or level = '5'),
unique (name, level)
);
create table Administrators (
ssn integer primary key check (ssn >= 0 and length(ssn) = 9),
firstName text not null,
lastName text not null,
phone integer not null check (phone >= 0 and length(phone) = 10),
gender text not null check (gender = 'm' or gender = 'f'),
dob date not null,
address text not null,
salary integer not null check (salary >= 0 and length(salary) < 6),
role text
);
create table Staff (
ssn integer primary key check (ssn >= 0 and length(ssn) = 9),
firstName text not null,
lastName text not null,
phone integer not null check (phone >= 0 and length(phone) = 10),
gender text not null check (gender = 'm' or gender = 'f'),
dob date not null,
address text not null,
salary integer not null check (salary >= 0 and length(salary) < 6),
role text
);
create table Teaches (
teachesId integer primary key autoincrement, -- Added this
ssn integer not null references Teachers (ssn),
courseId integer not null references Courses (courseId),
semester text not null check (semester = "Fall" or semester = "Spring" or semester = "Summer"),
year integer not null check (length(year) = 4 and year > 2012),
unique (ssn, courseId, semester, year)
);
create table Enrollments ( -- Changed majorly
ssn integer not null references Students (ssn),
teachesId integer not null references Teaches(teachesId),
grade int check (grade >=0 and grade <=4),
primary key (ssn, teachesId, grade)
);
create trigger update_grade_update_gpa
after update of grade on Enrollments
begin
update students
set gpa = (
select avg(grade)
from enrollments
where students.ssn = enrollments.ssn
);
end;
create trigger insert_grade_update_gpa
after insert on Enrollments
begin
update students
set gpa = (
select avg(grade)
from enrollments
where students.ssn = enrollments.ssn
);
end;
create trigger delete_grade_update_gpa
after delete on Enrollments
begin
update students
set gpa = (
select avg(grade)
from enrollments
where students.ssn = enrollments.ssn
);
end;
create trigger do_not_change_gpa
before update of gpa on students
begin
select raise(ignore);
end;