mysql_schemas.sql

Create table If Not Exists Users (user_id int, user_name varchar(20));
Create table If Not Exists Register (contest_id int, user_id int);
Truncate table Users;
insert into Users (user_id, user_name) values ('6', 'Alice');
insert into Users (user_id, user_name) values ('2', 'Bob');
insert into Users (user_id, user_name) values ('7', 'Alex');
Truncate table Register;
insert into Register (contest_id, user_id) values ('215', '6');
insert into Register (contest_id, user_id) values ('209', '2');
insert into Register (contest_id, user_id) values ('208', '2');
insert into Register (contest_id, user_id) values ('210', '6');
insert into Register (contest_id, user_id) values ('208', '6');
insert into Register (contest_id, user_id) values ('209', '7');
insert into Register (contest_id, user_id) values ('209', '6');
insert into Register (contest_id, user_id) values ('215', '7');
insert into Register (contest_id, user_id) values ('208', '7');
insert into Register (contest_id, user_id) values ('210', '2');
insert into Register (contest_id, user_id) values ('207', '2');
insert into Register (contest_id, user_id) values ('210', '7');