1. 1. SQL
   1. 1.1. RDBMS - Relational Databases
   2. 1.2. Popular Relational Databases
   3. 1.3. NoSQL
   4. 1.4. SQL Standards
   5. 1.5. Description
   6. 1.6. Schemas
   7. 1.7. DDL - CREATE TABLE
   8. 1.8. DML - Data Manipulation Language
   9. 1.9. INSERT INTO
   10. 1.10. Reject INSERT
   11. 1.11. SELECT FROM
   12. 1.12. NULL
   13. 1.13. SELECT FROM - WHERE
   14. 1.14. SELECT FROM - WHERE not
   15. 1.15. SELECT columns FROM - WHERE
   16. 1.16. Aggregates
   17. 1.17. constraints
   18. 1.18. PRIMARY KEY
   19. 1.19. ACID