In papers with journal IDs from 200 to 300 and with its short name starts with A, what is the percentage of papers with conference ID of 0?
journal ID of 200 to 300 refers to JournalId BETWEEN 200 AND 300; short name starts with A refers to ShortName LIKE 'A%'; Percentage = Divide (Count(ConferenceId = 0), Count(ConferenceId)) * 100
SELECT CAST(SUM(CASE WHEN T1.ConferenceId = 0 THEN 1 ELSE 0 END) AS REAL) * 100 / COUNT(T1.ConferenceId) FROM Paper AS T1 INNER JOIN Journal AS T2 ON T1.JournalId = T2.Id WHERE T1.JournalId BETWEEN 200 AND 300 AND T2.ShortName LIKE 'A%'
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)
);
