Introduction to SQL

[download the databases](https://raw.githubusercontent.com/gvwilson/sqlshort/main/docs/databases.zip)

Lessons

1. Introduction
2. Basic Selection
3. Filtering
4. Aggregation and Grouping
5. Missing Data
6. Joins
7. Keys
8. Subqueries
9. Modifying Data
10. Conditionals
11. Advanced Topics
12. Practice

Appendices

1. License
2. Code of Conduct
3. Contributing
4. Bibliography
5. Glossary
6. Answers

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