How many times more was the number of students of University of Ottawa than Joseph Fourier University in 2013?
Joseph Fourier University refers to university_name = 'Joseph Fourier University'; University of Ottawa refers to university_name = 'University of Ottawa'; in 2013 refers to year = 2013; how many times more refers to DIVIDE(SUM(num_students where university_name = 'University of Ottawa'), SUM(num_students where university_name = 'Joseph Fourier University'))
SELECT CAST(SUM(CASE WHEN T2.university_name = 'University of Ottawa' THEN T1.num_students ELSE 0 END) AS REAL) / SUM(CASE WHEN T2.university_name = 'Joseph Fourier University' THEN T1.num_students ELSE 0 END) FROM university_year AS T1 INNER JOIN university AS T2 ON T1.university_id = T2.id WHERE T1.year = 2013
CREATE TABLE country
(
    id           INTEGER not null
            primary key,
    country_name TEXT default NULL
);
CREATE TABLE ranking_system
(
    id          INTEGER not null
            primary key,
    system_name TEXT default NULL
);
CREATE TABLE ranking_criteria
(
    id                INTEGER not null
            primary key,
    ranking_system_id INTEGER          default NULL,
    criteria_name     TEXT default NULL,
    foreign key (ranking_system_id) references ranking_system(id)
);
CREATE TABLE university
(
    id              INTEGER not null
            primary key,
    country_id      INTEGER          default NULL,
    university_name TEXT default NULL,
    foreign key (country_id) references country(id)
);
CREATE TABLE university_ranking_year
(
    university_id       INTEGER default NULL,
    ranking_criteria_id INTEGER default NULL,
    year                INTEGER default NULL,
    score               INTEGER default NULL,
    foreign key (ranking_criteria_id) references ranking_criteria(id),
    foreign key (university_id) references university(id)
);
CREATE TABLE university_year
(
    university_id              INTEGER           default NULL,
    year                       INTEGER           default NULL,
    num_students               INTEGER           default NULL,
    student_staff_ratio        REAL default NULL,
    pct_international_students INTEGER           default NULL,
    pct_female_students        INTEGER           default NULL,
    foreign key (university_id) references university(id)
);
