The document is a presentation on SQL (Structured Query Language). It introduces SQL as the standard language for interacting with relational databases and managing relational database management systems (RDBMS). It discusses the history and development of SQL since 1970. It then covers key concepts in using SQL like database tables, columns, rows, queries, conditions, inserts, updates, deletes and best practices. The presentation aims to provide an introduction to SQL and takes questions at the end.

1. SQL
Why ‘Little Bobby Tables’ is funny
https://xkcd.com/327/

2. Hello!
I am Erik Tank
You can find me at @erik_tank
You can this talk at: https://github.com/skeletonkey/SQL_Intro

3. What is SQL?
• Structured Query Language
• ANSI (American National Standard Inst) standard*
• Allows for interactions with databases
• RDBMS (Relational DB Management System)
• MySQL, ProstgreSQL, et.al

4. 1970
“A Relational Model of Data for Large Shared Data Banks”
- Edgar Frank Codd
1970s
* SQL first developed (Raymond Boyce, Donald Chamberlin)
* Released to the public
1986
1st ANSI released
Sources: https://www.businessnewsdaily.com/5804-what-is-sql.html
SQL Primer by Rahul Batra (ISBN: 978-1-4842-3575-1)

5. Databases consists of…
• Tables
• Collection of data
• Columns (attributes)
• Rows (values)

6. Collection of Data:

7. Sample DB

8. Normalization
vs

9. 100% Normalized

10. Select Statement

11. Select Statement

12. Select Statement

13. Select Statement

14. Select Statement

15. Select Statement

16. Select Statement

17. Sub-queries

18. Explain Yourself!

19. Conditionals
• track_number = 1 or track_number = 2
• track_number in (1,2)
• track_number between 1 and 2
• name like ‘%week%’
• name ilike ‘%WEEK%’ *

20. Insert

21. Update

22. Delete

23. Do’s and DON’Ts
• SANITIZE YOUR INPUTS!!!!!!

24. Do’s and DON’Ts
• SQL in code

25. Do’s and DON’Ts
• Schema is your contract

26. Do’s and DON’Ts
• Atomicity (ACID)
• begin transaction;
• rollback transaction;
• commit transaction;

27. Do’s and DON’Ts
• DELETE statements
• Test
• Test
• Test!!!!
DELETE

28. Do’s and DON’Ts
• Table names should be singular
• ID fields are just ‘id’
• Columns name should NOT be reserved words
• ‘id’ field is ONLY for the DB
• UUID field is ONLY for the user

29. Questions?
You can find me at @erik_tank
You can this talk at:
https://github.com/skeletonkey/SQL_Intro

30. Questions?
You can find me at @erik_tank
You can this talk at:
https://github.com/skeletonkey/SQL_Intro

31. Questions?
You can find me at @erik_tank
You can this talk at:
https://github.com/skeletonkey/SQL_Intro