create table reader (
    number varchar(10) primary key,
    name varchar(20),
    gender varchar(8),
    age integer,
    major varchar(20)
);

INSERT INTO
    reader
VALUES
    ("20090005", "john", "male", 22, "math"),
    ("20090007", "sunnny", "male", 25, "medicine"),
    ("20090008", "lee", "male", 21, "medicine"),
    ("20090009", "nancy", "male", 26, "math"),
    ("20090010", "Billy", "female", 24, "science"),
    ("20090011", "tina", "female", 23, "physics"),
    ("20090012", "bunny", "female", 23, "physics"),
    ("20090013", "daisy", "female", 21, "science"),
    ("20090014", "henry", "male", 12, "science");

select
    *
from
    reader;