Fork this project, edit the SQL files to contain your problem, then commit and push your work into GitHub.
Take note of the formatting used to make the SQL files in this project clear and easily legible. When adding your SQL, take care to format it carefully.
Add the SQL Data Definition Language CREATE TABLE statements required to
construct a small test case to demonstrate your problem, to the file 1_create_tables.sql.
Add the SQL Data Manipulation Language INSERT INTO statements required to
describe the smallest possible sample of the data required to reproduce your
problem, to the file 2_insert_data.sql.
Add the query with which you're having problems, into the file 3_query.sql.
You're ready to go!