Martin Gruber
3.3 Subqueries
4.1 INSERT Statements
5.1 Data Modeling
3.2 Joins
2.1 Data Definition Language (DDL)
2.4 Data Control Language (DCL)
1.3 Benefits of SQL
I hope this helps! Let me know if you'd like me to expand on any section.
5.2 Normalization
Understanding SQL
3.1 SELECT Statements