From year 1991 to 2000, calculate the difference betweeen the total number of papers published under the conference "International Conference on Supercomputing " and "Informatik & Schule"?
From year 1991 to 2000 refers to Year BETWEEN 1991 AND 2000; papers refers to Paper.Id; 'International Conference on Supercomputing' AND 'Informatik & Schule' are the FullName of conference; calculate the difference between the total number of papers of these two conferences refers to SUBTRACT(SUM(Paper.Id where FullName = 'International Conference on Supercomputing'), SUM(Paper.Id where FullName = 'Informatik & Schule'))
SELECT SUM(CASE WHEN T2.FullName = 'Informatik & Schule' THEN 1 ELSE 0 END) - SUM(CASE WHEN T2.FullName = 'International Conference on Supercomputing' THEN 1 ELSE 0 END) AS DIFF FROM Paper AS T1 INNER JOIN Conference AS T2 ON T1.ConferenceId = T2.Id WHERE T1.Year > 1990 AND T1.Year < 2001
CREATE TABLE IF NOT EXISTS "Author"
(
    Id          INTEGER
        constraint Author_pk
            primary key,
    Name        TEXT,
    Affiliation TEXT
);
CREATE TABLE IF NOT EXISTS "Conference"
(
    Id        INTEGER
        constraint Conference_pk
            primary key,
    ShortName TEXT,
    FullName  TEXT,
    HomePage  TEXT
);
CREATE TABLE IF NOT EXISTS "Journal"
(
    Id        INTEGER
        constraint Journal_pk
            primary key,
    ShortName TEXT,
    FullName  TEXT,
    HomePage  TEXT
);
CREATE TABLE Paper
(
    Id           INTEGER
            primary key,
    Title        TEXT,
    Year         INTEGER,
    ConferenceId INTEGER,
    JournalId    INTEGER,
    Keyword      TEXT,
    foreign key (ConferenceId) references Conference(Id),
    foreign key (JournalId) references Journal(Id)
);
CREATE TABLE PaperAuthor
(
    PaperId     INTEGER,
    AuthorId    INTEGER,
    Name        TEXT,
    Affiliation TEXT,
    foreign key (PaperId) references Paper(Id),
    foreign key (AuthorId) references Author(Id)
);
