Add new quiz question to sql-quiz.ts

[Justin-Quinn51]

Summary of changes

#17

Contributed a new SQL question for use in the FCC Developer Quiz

Checklist

• I have read and followed the contribution guidelines.
• I have read through the Code of Conduct and agree to abide by the rules.
• This PR is for one of the available issues and is not a PR for an issue already assigned to someone else.
• My PR title has a short descriptive name so the maintainers can get an idea of what the PR is about.
• I have provided a summary of my changes.

[jdwilkin4]

Congrats on your first contribution to our repository. 🎉
We look forward to future contributions. 👍

[Justin-Quinn51]

Congrats on your first contribution to our repository. 🎉 We look forward to future contributions. 👍

Thank you! I'm grateful for having the opportunity to contribute to one of my favorite organizations.